21. A. attention B. behavior C. explanation D. reason
22. A. river B. pond C. lake D. dam
23. A. skating B. fishing C. swimming D. skiing
24. A. afternoon B. morning C. evening D. night
25. A. after B. until C. as D. if
26. A. go B. run C. sit D. wait
27. A. found B. threw C. took D. hid
28. A. lonely B. single C. alone D. afraid
29. A. noisy B. happy C. small D. young
30. A. changed B. disappeared C. increased D. stopped
31. A. filled B. controlled C. covered D. loaded
32. A. hit B. dragged C. set D. tapped
33. A. day B. hour C. minute D. second
34. A. head B. hand C. arm D. leg
35. A. left B.succeeded C. tried D. survived
36. A. worried B. surprised C. excited D. exhausted
37. A. lying B. standing C. laughing D. crawling
38. A. raising B. shaking C. holding D. washing
39. A. place B. mind C. defense D. rescue
40. A. take up B. make up with C. bring up D. come up with
