21. A. glance B. method C. motor D. panic22. A. eruption B. climate C. aspect D. district23. A. lung B. ash C. lava D. crater24. A. stated B. teased C. compared D. did25. A.in B. on C. from D. off26. A. have quitted B. have uttered C. have focused D. have killed27. A. active B. abstract C. ridiculous D. mental28. A. tries B. manages C. stresses D. contains29. A. which B. that C. if D. when30. A. going B. coming C. ending D. losing31. A. decreased B. bored C. swallowed D. connected32. A. hundred B. ten C. number D. thousands33. A. also B. either C. too D. as well as34. A.one B. neither C. both D. three35. A. more B. much C. less D. few36. A. that B. those C. ones D. this37. A. knew B. had known C. know D. knowing38. A. warn B. could have warned C. will warn D. can warn39. A. on B. near C. away D. besides40. A. lives B. life C. live D. believes