Stephen Hawking believes that the earth is unlikely to be the only planet     _life has developed gradually.        
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A
that
B
where
C
which
D
whose
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Can you make sure ______the gold ring?
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A
where Alice had put
B
where had Alice put
C
where Alice has put
D
where has Alice put
We’ll have to finish the job, _________.
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A
long it takes however
B
it takes however long
C
long however it takes
D
however long it takes