根据句意完成句子。

1. You can't _____ (穿过) the street. There are too many cars.

2. Please pay attention to your _____ (发音), Li Ming.

3. —How many kinds of _____ (语言) can you speak?

    — Three.

4. —What do you like to do on _____ (周末)?

    —I like taking pictures.

5. I will _____ (返回) my hometown tonight.

电灯悬挂在一根绳子下保持静止，则绳子对电灯的拉力（　　）

A．跟电灯对绳子的拉力互相平衡

B．大小等于电灯所受的重力

C．是由绳子形变产生的

D．是由电灯形变产生的