15. Would you mind
B. reading
16. Yesterday, at the end of the city tour, the bus
C. has brought
17. Let's go for a walk this evening,
C. shall we
18. We had prepared the meal
B. carefully
19. Eating plenty of fresh fruit and vegetables will keep you healthy.
A. in good shape
20. One of the drawbacks of tourism is damage to the environment.
D. benefit
21. You can buy a lot of top-quality products at a very affordable price here.
B. costly
22. I really like Ha Noi because the local people were very kind and hospitable.
B. friendly
23. - Sally: "What about collecting used paper every day?" - Jenny:
C. That's a good idea.
24. - Peter: "Would you like some more tea?" - John:
D. Thanks, it's nice of you.
25. UNESCO has given an award to a festival in South Korea's Lotus Lantern Festival to its list of intangible:
C. in
26. It decided (to) add the South Korean festival to its heritage list:
C. to add
27. South Korea added it to its cultural heritage:
A. cultural
28. The festival is held every spring:
A. held
29. Cities and villages hold parades:
D. and
30. "If I were you, I would take the job," said my room-mate.
B. My room-mate advised me to take the job.
31. New York City is busier than any other city in the world.
(You didn't provide the options for this one, but based on the sentence structure, the answer could be: "New York City is the busiest city in the world.")