II/ Choose the best answer:(3) 21. He is surprised __________that there are 54 ethnic groups in our country. A. to understand B. to study C. to know D. find 22. The Viet (or Kinh)have______number of people, account for about 86% of the population. A. large B. the large C. larger D. the largest 23. ________ ethnic group has a larger population, the Tay or the Ede? A. What B. Which C. Why D. Who 24.Ba spends his free time … volunteer work at a local orphanage. A. to do B. do C. to doing D. doing 25. He prefers ______A. go for a swim to study B. going for a swim to study C. going for a swim to studying D. go for a swim to studying 26. Martina has loved sports _____she was a child. A. since B. for C. when D. as 27. It has been the____ day in London for 35 years. A. hoter B. hotter C. hotest D. hottest 28. If you move to your left, you_____the church. A. will see B. are seeing C. has seen D. see 29. Is the rubbish______ every day? A. collect B. collecting C. collected D. be collected 30. Sooner or later a satellite _______ by a large piece of rubbish. A. will destroy B. will destroyed C. will be destroyed D. will been destroyed