根据句意和汉语提示，填写恰当的短语完成下列句子。

1. Girls_____(组成) only 30% of the club members.

2. Who does this bicycle_____ (属于)?

3. Whose_____(发带) is this?

4. We had a lot of fun_____(在野餐时) on the beach.

5. David had to drop out of the race_____(由于) injury.

埋在地坪内塑料管的弯曲半径一般不应小于其公称直径的（）。

A、5倍

B、10倍

C、15倍

D、20倍