At last the enemy soldiers had no choice but     their guns and   .

The teacher asked the students to stop         and        to her.

We must do everything we can      waste water from running into rivers。

我们应该学会保护自己。远离拥挤的人群。记住：不管做什么，安全第一！
We should learn to____ ourselves. Stay away from the crowd. Remember: Whatever you do, safety is first！

用所给词的适当形式填空。
When squirrels tried to cross the street, they were killed. Amos Peters wanted____ ____ (protect) these small and lovely animals, so he built a bridge for them—one that would let them pass above the traffic.

——你能告诉我你打算怎么去香港出差吗？
——当然。我更喜欢坐飞机。
—Could you please tell me how you will go to Hong Kong on business?
—Sure.I ____ to take a plane.