(2013·浙江温州二模)Scientists have found evidence ________ global warming caused the world's first horses to become smaller nearly 50 million years ago.
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A
what
B
that
C
which
D
whether
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________________, I was so careless that it got loose and was hit by a car.
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A
While I walked the dog
B
While I walking the dog
C
While walking the dog
D
While I am walking the dog .
__________has finished the work ahead of time will be rewarded．
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A
Those who
B
Anyone
C
No matter who
D
Whoever
People are recycling many things which they away in the past.
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A
had thrown
B
will be throwing
C
were throwing
D
would have thrown