1 . He is too young to go to school. (改为同义句)
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2 . 他跑得非常快，没人能追上他。
He runs ________ fast ________ nobody can catch up with him.

3 . 他太累了，以至于不能走路了。
He is ________ tired ________ he can’t walk.

4 . 她学习如此勤奋以至于忘了时间。
She studied ________ hard ________ she forgot the time.

5 . 前一晚，我太兴奋了以致睡不着。 （so...that）       
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6 . The mountain is ________ big ________ it takes a long time to walk to the other side.

A．so; that

B．so; much

C．very; that

D．too; that

7 . 我很激动，以至于无法入睡。
I was _________ excited _________ I couldn’t fall asleep.

8 . Mary is ________ old ________ she can go to school.

A．so; that

B．such; that

C．too; to

D．so; for

9 . 天太黑了以至于我什么都看不见。
It is ________ dark ________ I can’t see anything.

10 . David isn’t old enough. He can’t look after himself. (合并成一句)
David is ________ ________ ________ he can’t look after himself.