1 . 这些信都有漂亮的配图——每个都一定花了其真正的作者——托尔金很长的时间才完成。
The letters were also beautifully illustrated—each ________, Tolkien, ________.

2 . 他们一定是在森林里迷路的孩子；否则，他们就会按计划去湖边露营了。
They ________________ the children lost in the woods; otherwise, they would have been at the lakeside camp as scheduled.

3 . —Why didn’t you come to Mike’s birthday party yesterday ?
—Well, I________, but I forgot it.

A．should

B．must

C．should have

D．must have

4 . ________________ (肯定有人打开了笼子). The dog couldn’t have escaped on its own. (根据汉语提示完成句子)

5 . There was no one else in the classroom, so he ______ it by himself.

A．should have done

B．need have done

C．must have done

D．could have done

8 . It ___________________ last night, for the ground is still wet.
昨晚一定下雨了, 因为地面还是湿的。

10 . The ground is covered with water. It must have rained last night. （英译汉）
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