I want to go to Beijing by _______train, but my sister wants to take ______ plane.

Mr. Black is strongly _______keeping animals in the zoo, because he thinks animals should also have the right to enjoy freedom.

It’s raining heavily! Why mustwe go out right now—- The reason is that we are going tohelp the villages on the mountains.—- ______.

下列各组加横线词意义和用法相同的一项是（ ）。

下列各句中，表达得体的一句是（ ）