Read the following texts and mark the letter A, B, C or D to indicate the correct word or phrase that best fits each of the numbered blanks.

[16] The coronavirus is a kind of virus. Viruses are tiny germs that are so small that you can’t see them. They are so (1) ________ that they can float through the air in tiny drops of water, and they can sit on your skin without you feeling them. If some of these germs get inside you, they can use your body to make more germs, and that can make you ill.

There are lots of different sorts (2) ________ coronaviruses and some of them infect people. If you have been infected with one of these coronaviruses, all you probably (3) ________ was a snotty nose or a cough.

But when this completely new coronavirus germ gets inside a human body, it causes (4) ________ illness called COVID-19. When people talk about “catching the coronavirus”, they are talking about this illness. Because this coronavirus is new, scientists don’t know everything about it yet. But they think that there are two main (5) ________ that people can catch it.

[17] The relationship between students and teachers is less formal in the USA than in many other countries. American students do not stand up (1) ________ their teachers enter the room. Students are encouraged to ask questions during class, to stop in the teacher’s office for extra help, and to phone if they are absent. Most teachers (2) ________ students to enter class late or leave early if necessary. (3) ________ the lack of formality, students are still expected to be polite to their teachers and fellow class mate.

When students want to ask questions, they usually (4) ________ a hand and wait to be called on. When a test is being given, talking to a classmate is not only rude but also risky. Most American teachers considers that students who are talking to each other (5) ________ a test are cheating.

[18] There are many embroidery villages in Viet Nam, but Quat Dong village in Ha Noi is widely known for its products of high quality.

Embroidery has been developing around here (1) ________ the 17th century. In the past, local skilled artisans were chosen to make sophisticated embroidered costumes for the Vietnamese King, Queen and other Royal family members. The first man (2) ________ taught the local people how to embroider was Dr. Le Cong Hanh, who lived during the Le dynasty. He learned how to embroider while on a trip to China as an envoy, and taught the villagers of Quat Dong upon his return. Although these skills eventually spread across (3) ________ country, the Quat Dong’s artisans’ creations are still the most appreciated. In order to create (4) ________ embroideries, an artisan must be patient, careful and have an eye for design, along with clever hands. Nowadays, Quat Dong products may range from clothes, bags, pillowcases, to paintings and decorations, which are (5) ________ to many countries.

[19] Living in Vietnam today differs greatly from the lifestyle of 100 years ago. People in the past mainly worked in agriculture (1) ________ today there are significantly less people working in this sector of the economy. These days, by comparison, people are more likely to be employed in manufacturing and tourism than in the rice fields. Moreover, Vietnam, which was (2) ________ agrarian, is transforming into an entirely different country. While agriculture is still an important component of the Vietnamese economy, other enterprises are accounting for an increasing amount of economic activity.

However, along with the differences, similarities also exist. The people of Vietnam have retained many of the characteristics of (3) ________ forefathers. The Vietnamese people are as friendly today as they were in the past. This is best exemplified in the way they welcome foreigners (4) ________ their unique country. Moreover, the resilience and determination of the people of Vietnam has not changed. The Vietnamese work collectively and happily towards the (5) ________ of their country.

[20] Like other big cities in Asia, Ha Noi began to operate the tram system in the early 1900s. A few years later, due to its cheap fares and convenience, this system rapidly became one of the most popular (1) ________ of transport. There were five tram routes with Hoan Kiem Lake as a central station for residents to get (2) ________ the city and to the suburban areas. However, (3) ________ the population boom and the urgent demand for upgrading the more modern road system, the rail tracks were gradually removed and completely disappeared in 1990.

These days, the fact that the population of the capital has risen tremendously results in a dramatic increase in the number of vehicles on the roads. To meet the (4) ________ travel demands and reduce traffic congestion, the first 13-kilometre skytrain system, connecting Cat Linh and Ha Dong is launched and it is expected to be completed by 2018. Each four-compartment skytrain with the length of approximately 80 metres and the height of about 3.8 metres has a capacity of 1,362 passengers. Additionally, a new rail system including over eight kilometres of skytrain rail and four kilometres of subway rail, (5) ________ links Ha Noi Central Station to Nhon, also has being built recently. The capacity of each skytrain in this efficient high-speed rail system is roughly 1,200 passengers.