问题描述：
1.He has been making kites since 2 years ago.
He has been making kites ______ 2 years .
It is two years ______ he ______ to make kites.
2.I am certain I will be here in time.
I am certain ______ ______ here in time.
He has been making kites ______ 2 years .
It is two years ______ he ______ to make kites.
2.I am certain I will be here in time.
I am certain ______ ______ here in time.
问题解答：
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