根据句意及括号内所给词的适当形式填空。

1. These are _____ (pen).

2. _____ (be) those your parents?

3. This is _____ (she) gold ring.

4. Here are two _____ (photo) of my family.

5. Those _____ (child) boats are on the river.

6. Mr. Li _____ (have) a new car now.

7. _____ (who) baseball is that?

8. Are these your keys? No, _____ (it) aren't.

9. Is this _____ (you) son?

10. What colour are the _____ (watch)?

以下关于《建设工程造价咨询合同（示范文本）》的描述哪一项是正确的（）。

A.《建设工程造价咨询合同（示范文本）》具有强制使用效力

B.《建设工程造价咨询合同（示范文本）》仅参考使用

C.《建设工程造价咨询合同（示范文本）》中部分条款具有强制使用效力

D.《建设工程造价咨询合同（示范文本）》具有强烈的前瞻性