用括号中的词的适当形式填空

we have _________(grow) over two hundred trees since 2007

take this medicine _________(two) a day.

shenzhou VI is an __________(man) spacecraft,isn't it

they have spent three ______(billion) on the problem

It is not polite to ask a wonman's age in some counrties because it's a _________(secret) for her

grown 用过去分词

twice 一天两次

manned 载人宇宙飞船

billion 不能用复数

secret 秘密

grown

twice

manned

billion

secret

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