92. All that must be done _______________(do).

91. My friend can't decide which pair of trousers____________(choose). So she asked me to go shopping with her.

90. She doesn't know what_________(do) and where__________(go).

89. Would please tell us how___________(make) the watch ________(work)?

88. The radio__________(use) once in a week in our class.

It____________(not use) yesterday because there was something wrong with it.

87. The old man often_________(tell) the children a story in the evening.

This evening he ________(tell) two stories .

69. A pen is used for__________(write). 70. They find it useful__________(learn) English.

68. Jiefang trucks____________(make) in Changchun.

67. He'll telephone us as soon as he_________(arrive) there.

66. ______you ever_______(be) to Beijing?Yes. I________(go) there last week.