题目内容

I shall never forget (see) _______ the Great Wall for the first time two years ago.

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Although they (work) ____________ in the same company for five years, they know very little about each other’s background.

The old professor gave us a number of very (help) _______ suggestions.

He said regrettably that he should have treated the experiment as (careful) ________ as he could.

Do you think it useful (argue) ________ with her anymore about this problem?