I can’t learn English well. What can I do, Mr. Smith— Tom, ________ is difficult if you work hard.

You may ______the shoes but not return them for a refund( 退还). [ ]

___ I agree with most of what you said, I don’t agree with all.

When _______how a statue from distant Greece could have appeared in China, researchers explained that no doubt this was a result of Alexander the Great’s influence.

Hetold us whether _________ a picnic was still under discussion