If we keep wasting so much energy, ________are that our oil wells will dry up and the environment will be destroyed.

I'm interested in a single room. Do you have any ________？

---I will have to think about it again．
--- If you _    , you may lose the opportunity to compete altogether．

Exploring ________space is exciting, yet dangerous. There is ________need for both robots and humans for space exploration.

The country life he was used to_________ greatly since 1992.

A man is being questioned in relation to the _____murder last night.

--- Where is your great-grandmother __________ your mother’s side from?
--- She is from Beijing．

Son: I cheated in the exam and was caught by my teacher on the spot.
Father: _______!

Mr. Wang told us that he would devote all the time he could spend _______ his oral English before going abroad.

---Is Michael a man with good manners?
---I don’t think so. As a matter of fact, he is ______but polite.