题目
A.mustn’t
B.can’t
C.needn’t
D.don’t
第1题
A.clean
B.cleaned
C.cleaning
第4题
A.We should plants more trees and flowers.
B.We should clean the banks of our rivers.
C.We should know what will happen in the future.
D.We should know what we must do and begin to do now.
第5题
Water ___3___ almost everywhere. Even in the driest part of the would there is some water in the air. You can not see it or feel it when it is part of the air. The water ___4___ seas and rivers is a liquid. The water in the air is not a liquid but a gas.
Clouds are made of water. They may ___5__ made of very small drops of water. Water, you have found,is very useful, so we must save water.
1)、A.ourselves
B.is found
C.be
D.in
E.no
2)、A.ourselves
B.is found
C.be
D.in
E.no
3)、A.ourselves
B.is found
C.be
D.in
E.no
4)、A.ourselves
B.is found
C.be
D.in
E.no
5)、A.ourselves
B.is found
C.be
D.in
E.no
第8题
To obtain a satisfactory result, one must apply two ______ of paint on a clean surface.
A.coats
B.levels
C.times
D.courses
第10题
Dirty oil must be ______before being used again .
A.mixed with clean oil
B.purified
C.heated
D.strained
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