用适当的介词填空

At that time life was not known ________ scientists.

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There are a lot of ways ________ make friends.

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Good measures must be taken by the government to stop some companies ________ harming the environment.

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You will regret in time.

You will regret ________ ________ ________.

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My classmates as well as I went to the park yesterday.

My classmates went to the park yesterday. I went, ________ ________.

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He came to Beijing for the first time.

It is the first time that he ________ been ________ Beijing.

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He pretended that he was a poet.

He pretended ________ 　　　　 a poet.

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At last, he told us everything.

________ , he told us everything.

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He didn't appear until it's 8 o'clock.

He ________ appeared until it's 8 o'clock.

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________ be honest, I know little about him.