3. The        (frontier) of medical knowledge are being pushed forward as time goes on.

2. What has        (motivate) you to do such a thing?

1. It is another accomplished        (work) by the artist.

5. 从那家公司辞职后，汤姆开始卖保险。

After he resigned from that company,Tom       insurance as a profession.

4. 吸烟能导致多种疾病。

Smoking can        many diseases.

3. 我代表我的妻子感谢你。

      my life,I thank you.

2. 他跑得很快，把我抛在后面了。

He ran so fast that he       ,

1. 你明天就要去上海吗？

Are you        Shanghai tomorrow?

8. We were greatly        (鼓舞) by his heroic deeds.

7. The robbers        (逃跑) when they saw the police.