1、No one failed in the exam, ________?
A.was he
B.did one
C.did they
D.didn’t he
2、It was announced that only when the fire was under control ________ to return to their homes
A.the residents would be permitted
B.had the residents been permitted
C.would the residents be permitted
D.the residents had been permitted
3、—How’s your tour around the North Lake? Is it beautiful? —It ________ be, but it is now heavily polluted
A.will
B.would
C.should
D.must
4、This washing machine is environmentally friendly because it uses ________ water and electricity than ________ models
A.less; older
B.less; elder
C.fewer; older
D.fewer; elder
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