,butitisalsoagreatwaytolowerth

_______,but it is also a great way to lower the number of greenhouse gases in the air.

A．Not only a fun thing is it to do

B．Not only a fun thing to do it is

C．Not only it is a fun thing to do

D．Not only is it a fun thing to do

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—When I was playing football, my strength ___________ and I fell down.

A．gave up

B．gave off

C．gave out

D．gave in

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A．in whom

B．in them

C．of whom

D．of them

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---Thank you very much for helping me out of trouble, Bob.
----__________.

A．With pleasure

B．Don’t mention it

C．That’s right

D．I hope so

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A．for; as

B．with; for

C．as; for

D．like; as

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Niagara Fall is a great tourist ________, drawing millions of visitors every year.

A．attention

B．attraction

C．appointment

D．arrangement

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