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1·He had better do some research!

他最好作一下调查。

2·We had better do it right now.

我们最好马上做这件事。

3·You had better do it at once.

你最好还是马上做。

4·He had better do some research.

他最好作一番调查。

5·You had better do exercise every day.

你最好每日进行锻炼。

6·He thought over what he had better do.

他想了想他最好怎么办。

7·You had better do your homework right now.

你最好马上去做你的作业。

8·And we had better do not tell lies to our best.

我们最好尽量不要说谎。

9·You had better do some sports after supper every night.

你每晚吃完饭后最好做做运动。

10·If one wants something done well he had better do it himself.

如果一个人要把事情做好，最好自己去做。