用括号中所给的动词的适当形式填空。

1. Mr. Wu invited Kitty ________ (join) their trip to the World Park.

2. It is very interesting for them ________ (remove) the snow in winter.

3. Suzy ________ (make) a snowman while Kitty was taking some photos.

4. If the temperature ________ (drop) to 0 ℃, the water will become ice.

5. Yesterday a young boy ________ (fall) from a tree and hurt his legs.

驾驶机动车通过铁路道口时，最高速度不能超过多少？

A．15公里/小时

B．20公里/小时

C．30公里/小时

D．40公里/小时