—I' m sorry, but I didn’t mean__________ out your secret.
—But you know, letting out one's secret means________ one' s feelings.

I wondered what difficulty he had _________ the plan?

My friend, David, was not used __________ by air, so he felt unwell.

______ a family of chimps wake up is our first activity of the day.

_______ Jane’s way of studying chimps, our group are all going to visit them in the forest.

What is the best way you can imagine        the overuse of water in our daily life.

The Olympic Games，       in 776 B．C．，did not include women players until 1912．
A．first playing               B．to be first played
C．first played                 D．to be first playing

They couldn’t stand        like that．

Chen Xiexia is the first Chinese athlete ______ the gold medal in the Beijing Olympic Games.

______ many times，he finally understood it．