按要求写句子。  

1．威尼斯入睡了。

扩句：                                                        

2．小艇穿过一座座形式不同的石桥。

缩句：                                                                 

3．槐乡的八月，是孩子们最快乐的时光。  

改成反问句：                                               

4．威尼斯小艇很快。 

改成感叹句：                                                                           

----- It was a red light, William. You ________ the car.

------- Sorry, I didn’t see it.

A．must stop

B．should stop

C．must have stopped

D．should have stopped