4. If you put a stick in a glass of water, the stick looks as if it __________(be)broken.

3. When first ____________(introduce)to the market, these products enjoyed great success.

2. __________(discuss)many times, the problems were settled at last.

1. ________ (lose)in the fog, we were forced to spend two hours in the woods.

10. It’s a good book, but _______ sales it hasn’t been very successful.

(二)根据句子意思写出括号内所给单词的恰当形式。

9. I watched __________ as she tore up the contract and threw it into the bin.

8. She ______ herself _______ a police officer and gained his trust.

7. He failed to ______ the teacher ____ his honesty.

6. Are you ________ help? Tell me when you are in trouble?

5. I’d better _________now　 --- the baby is crying. I’ll ring you back later.