题目内容
All parents worry about( ) their children are getting enough of the right foods.
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We are said ( ) in the Digital Age.
They discovered that some young plants make a clicking sound in their roots, which is so quiet that human are ____________ (able) to hear it.
Mary was so tired that she was ______________ (able) to go any further．
What are your plans for the ____________ (develop) of your company?
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