C. give up

　　D. send out

　　16. A. expected

　　B. forced

　　C. needed

　　D. reminded

　　17. A. doubt

　　B. question

　　C. wonder

　　D. challenge

　　18. A. suffering

　　B. upset

　　C. trouble

　　D. discomfort

　　19. A. serious

　　B. light

　　C. heavy

　　D. slight

　　20. A. aware

　　B. alive

　　C. knowing

　　D. sensible

　　Ⅳ. 阅读理解

　　From the first use of the rocket to carry satellites into space to the setting up of space stations, human beings have been putting great effort into space research. And so far, we have achieved many successes. But there are still countless tasks in front of us and we should not stop trying to progress.

　　The international space station is an important step we should take in space exploration. It is not only helpful but also essential. It provides a proper space environment for many experiments that we have wanted to do for a long time. It is also a base for the observations of the earth and the universe. It could also be an important base for later travel to the moon and Mars. In a word, if we want to explore more space, the first thing we should do is to set up a space station.

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