.－Who taught _____ to swim?－I learned it by _____.

I dare say you will definitely miss your flight if you don’t hurry. —Oh, _____. It’s almost the time.

A: _____is Mary?B: I think she is at home．

Excuse me, is there book by Mo Yan?—Yes. It’s on bookshelf over there.

Would you like me to carry the box? —-_____.