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Don’t____ to let me know if there is anything I can do for you.

What can I do for you?          .

I didn’t know the word; I had to ______ a dictionary.

—I'm glad to have met you. Drop by sometime. —          .

—Can I help you with your luggage? —                          .

You don’t know about the difficulty I had ______ the work then at all.

I suddenly realized that he was trying to _____ quarrelling with me

— I’m sorry that I’ve broken your radio． —          ．I have got another one in my office．

It’s rather cold in here. Do you mind if I close the window? ____________.

I’m sorry. I lost the key. ______________.