31（）the Internet is of great help, I don't think it's a good idea to spend too much time on it.
A.If
B.While
C.Because
D.As
开始考试练习点击查看答案32There were some chairs left over（）everyone had sat down.
A.when
B.until
C.that
D.where
开始考试练习点击查看答案33You have no idea how she finished the relay race（）her fool wounded so much.
A.for
B.when
C.with
D.while
开始考试练习点击查看答案34（）hungry I am，I never seem lo be able to finish off this loaf of bread.
A.Whatever
B.Whenever
C.Wherever
D.However
开始考试练习点击查看答案35I used to love that film（）I was a child, but I don't feel it that way any more.
A.once
B.when
C.since
D.although
开始考试练习点击查看答案36Between the two generations, it is often not their age,（）their education that causes misunderstanding.
A.like
B.as
C.or
D.but
开始考试练习点击查看答案37You have failed two tests. You'd better start working harder,（）you won't pass the course.
A.and
B.so
C.but
D.or
开始考试练习点击查看答案38Leave your key with a neighbor（）you lock yourself out one day.
A.ever since
B.even if
C.soon after
D.in case
开始考试练习点击查看答案39Small sailboats can easily turn over in the water（）they are not managed carefully.
A.though
B.before
C.until
D.if
开始考试练习点击查看答案40It is difficult for us to learn a lesson in life（）we' ve actually had that lesson.
A.until
B.after
C.since
D.when
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