To some of our problems there was more than one right answer, so we were looking at th
The "mad moments" in the first paragraph refers to when we ______.
A.have some mental problems
B.have lost our important things
C.don't listen to what our friends tell us to do
D.fail to remember what should be remembered
We must keep away from some _____, for they will do harm to our health.
A.chemistry
B.chemists
C.chemical
D.chemicals
Some of the experiments _____ in our textbook are difficult to perform.
A.to describe
B.be described
C.describing
D.described
We want to learn some English songs, () we can sing for our foreign guests.
A、so that
B、so
C、for
A.sensitive
B.sensible
C.sense
D.seasoning
A. none
B. some
C. most
D. all
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