1、We can’t ______ people to change the habits of their lifetime over a short time.
A.agree
B.wait
C.expect
D.imagine
2、The only language ______ is easy to learn is the mother tongue.
A.which
B.that
C./
D.it
3、Up to now, our society ______ with limited living space and a shortage of natural resources.
A.has been challenged
B.is being challenged
C.is challenging
D.has challenged
4、______ trees have been planted near here, so the air is very fresh.
A.Two hundreds
B.Hundred of
C.Hundreds of
D.Hundreds
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