6.All of the machines will have a special card ___ .
A.start
B.to start
C.starting
D.to starting
7.If we ____ all the trees, there will be no more oxygen for us to breathe
A.cuts
B.cut off
C.cutting
D.cut down
8.We should open all the windows, so we don't ____ to use air-conditioners. *
A.have
B.have to
C.needn't
D.need
9.Plant more trees in the schoolyard because they will provide shade and ____ the atmosphere fresher.
A.do
B.make
C.have
D.use
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Sinh Học lớp 12
