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.

4 . 她断定他准是把包落在火车上了。
She reasoned that she ________________ on the train.

5 . ________________ (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)

6 . “What?!” I tried to turn on my brain but the engine just wouldn’t start.
(Please describe the situation when you couldn’t find your key in front of the door.) (按要求仿写)
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7 . They _____________________(一定意识到) that we were totally helpless, for after a few moments, they wandered over and pushed us free. (根据汉语提示完成句子)