3.They thought that there must be something wrong with their TV set.

2.The friend saw everything but did not say a single word.

4.You and your team can discover the answers to problems together.

67. You needn’t go there anymore. He already knows about it.

51. The students are encouraged to do more listening, reading and writing by their teacher.

60. All that glitters is not gold.

30.I rang your house last night but your mother answered the phone.

18. How are you doing these days?

56. Each time history repeats itself, the prices goes up.

40. She likes to help any one who is in difficulty.