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Humans are slowly polluting the whole world and there is not enough clean air _______ water. We must take action, _______ things will be worse.
A. and; and B. or; and C. and; or D. or; or
答案
D
Ted has ten soccer balls, _____he doesn't play them.
A.and B.with C.but D.of
Don’t fight in class __________don’t run in the hallways.
A.or B.so C.but D.and
Susan is good-looking,__________she’s a little hit short.
A.so B.with C.or D.but
Jane, please turn off the lights ______ you leave the classroom.
A.after B.before C.until D.but
--Hurry up! The bus is coming.
--Wait a minute.Don't cross the street ________ the traffic lights are green.
A.until B.after C.while D.since
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