26. I don't know (C. how ) to explain it.
27. I don't like coloured clothes. I like white(A. ones ).
28. (C. By ) the end of the next week, we'll have read five books.
29. A: Whose book is this? B: It's (B. mine ).
30. (C. Neither ) her mother (nor ) she was at home when the thief came in.
31. Once the decision _A. has been made___, the most important thing to do is how to carry it out.
32. If I don’t have to work late on Friday, I might (C. go) dancing with friends.
33. I didn’t buy the book because I didn’t have (B. any ) money on me.
34. If you agree to have this operation,A. chances are that you may recover sooner.
35. If it (C. doesn't rain, ) tomorrow, we (will go ) to the Summer Palace.
36. He arrived ( B. on) good time for the concert.
37. The investigation group, which (C. is composed of 2 men and 3 women, started this morning.
38. Don't worry. Everything will ( A. work out) well in the end.
39. His mother (A. as well as ) his father is busy with work.
40. We should judge a man by his(B. acts), not by his talks.
41. The baby is named (C. after ) the nurse who was looking after her.
42. He was severely ill, (C. so serious to that he had to lie in bed.
43. I'll just go and ( B. find out) what's going on outside.
44. Each ticket (C. admits) only one person to the exhibition.
45. I don't like that girl because she is always ( B. low or down).
46. Get up! Mary. Tom has (B. already ) called you three times this morning.
47. Frank, ( C. who) is interested in computer games, came here yesterday.
48. He (A. has been married ) for almost ten years.
49. He came here a year (A. ago, ), and I have been here ( for ) two years.
50. Be careful! Don't cut ( C. yourself) with the knife.