根据句意写单词。

1. My father doesn't like playing sports, but he likes to _________ them on TV.

2. I don't like math. It's _________.

3. This question is _________ I can't answer it.

4. Edgarson has a great sports _________. He has so many balls.

5. My father goes to work every _________.

当地下室的底版和墙体采用钢筋混凝土结构时，可采取自防水方式措施提高防水性能。具体有以下哪几种方法？（）

A.采用骨料级配混凝土

B.设置防水层

C.采用外加剂混凝土

D.以上均不正确