1.a truck went out of control and________(碰撞) into the back of a bus.
2.the smell of new bread________(飘动) up from the kitchen.
3.don't________(拉) so hard or the handle will go off.
4.as we all know, qian xuesen is a famous________(物理学家).
5.we should form the habit of living in low________(碳).
6.the space shuttle orbited a communication________(卫星).
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