C. mustn’t be

　　D. must be

　　(

　　)5. You mustn’t go off on your own, because you ____ get lost in the mountains.

　　A. should

　　B. must

　　C. need

　　D. might

　　三、提高题： 完形填空:

　　One day an Australian farmer, Joe saw a bright light in the sky. ①The light came nearer and nearer and suddenly Joe saw that it was a spaceship. The spaceship landed in a field quickly.

　　The door of the spaceship opened and two strange beings climbed out . ②They seemed to be half man and half bird. Joe was afraid of them. He tried to run away. But the spacemen walked towards him, picked him up and carried him into the spaceship. They put wires(电线) from a machine onto his head and they could speak to him in English.

　　They asked him some questions about the earth. “We are from Venus,” they said. “but it’s getting very hot there. A lot of people are dying and we don’ t have much time left. We are trying to find a new home.

　　After some time they ③freed Joe and at last the spaceship took off and could not be seen again. Joe told his friends about the spaceship, but no one believed his story.

　　“You’ll believe me one day,” Joe told them, “The spacemen will come back....”

　　翻译 ①处画线部分的句子。______________________________________________________________.

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