【题目】Air pollution has become ____than ever before. We must do something to stop it.
A.the more serious
B.more serious
C.seriouser
D.the most serious

【题目】You will make great progress in English ______ you never give up.
A.and
B.as long as
C.or
D.but

一For more than 10 years.

A. Haw far B. How soon

C. How long D. How old

A. shouldB. oughtC. mustD. can

A. convenientB. conveniently

C. more convenientD. more conveniently

A.loudlyB.loudC.quiet

—She goes there boat.

A. What;takesB. What;by

C. How;takesD. How;by

A. aboutB. withC. forD. from

【题目】Who is going to take care of Tom when his parents are away ____ business?
A.in
B.with
C.for
D.on

【题目】David gave two______ his money to the poor children in the countryside.
A.millions of
B.million
C.millions
D.million of