Wemusttakemeasurestostopvariou

We must take measures to stop various kinds of pollution ______ the environment gets worse.

A．unless	B．until
C．before	D．when

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相关试题

It was with great courage ______ the boy told the truth _______ he had stolen the money.

A．which; that

B．when; what

C．as; that

D．that; that

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________ as one, the people of that country eventually drove the invaders (侵略者)out of their country.

A．Linked

B．Combined

C．Joined

D．United

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Allow children the space to express their opinions ________ they are different from your own.

A．until

B．even if

C．unless

D．before

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Thousands of athletes______ in many countries will compete _______ medals in the 2008 Olympic Games in Beijing.

A．involved; in	B．involving; by
C．to involve; against	D．involved; for

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Would you like to ______ us? We are going to _____ the school’s 20th anniversary celebration.

A．join in; take part in	B．join in; join
C．take part in; join	D．join; take part in

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