The town official broke ________ for working over time in the search for the trapped people after the earthquake.

Chemical pollution will bring about a threat to agriculture and food chain, and ________ to human health.

When we think of communication , we _________ think of using words---- talking face to face, writing messages, and so on .

---Fish need water to survive; _____ , we human beings rely on air to live.

In the good care of the nurse, the boy is       recovering from his heart operation.

It is still a problem ______ to hide the stolen money.

My parents lent me the money. ________, I couldn’t have afforded the trip.   

When Helen saw his tutor nod ________ to her, she calmed down and went on with her performance.

I don't have enough money．I, _____, can't afford to buy Audi A3 Sportback．

His hard work paid______ when he got the result.