1 . 他们太累以致于在公共汽车上睡着了。
They were__________________ they fell asleep on the bus.
They were
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2 . 她如此担心儿子的安危,以至于整宿没睡着觉。
She was_______ _______ about the safety of her son_______ she couldn’t_______ asleep the whole night.
She was
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