Look and write.

1. A: What did you do on your holiday？

    B: I                                       

2. A: What did you do on your holiday？

    B: I                                         .

3. A:                      on your holiday？

    B: I                                         .

4. A:                                          ？

    B:                                            ？

5. A:                                            ？

    B: I                                           ？

.

要改变分析天平的灵敏度可调节（）。

A.指针

B.平衡螺丝

C.旋钮

D.感量螺丝