根据答句写问句。

1. A:___                                     _?

    B: My ruler is 20 cm long.

2. A:                                             ?

    B: I have a headache.

3. A: ___                                     _?

    B: I went to a park yesterday.

4. A:____                                     ?

    B: I bought many presents on my holiday.

5. A:__                                      __?

    B: He went there by bike.