第一节 单项填空(共15小题；每小题1分，满分15分)
从a、b、c、d四个选项中，选出可以填入空白处的最佳选项。
21．many people are not ________ the dangers of their children’s bad habits，which lead to failing to make their dreams come true.
a．well aware to b．very aware of
c．aware that d．well aware of
22．our bodies are strengthened by taking exercise.________，our minds are developed by learning.
a．probably b．likely
c．similarly d．generally
23．________by a greater demand for vegetables，farmers have built more green houses.
a．driven b．being driven
c．to drive d．having driven
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