There are so many kinds of radios in the shop. I can’t decide _________.
#56296
A
to buy what
B
to buy which
C
which to buy
D
when to buy
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It       Yang Liwei about 21 hours       the earth 14 times in his spaceship.
#57516
A
spent; circling
B
took; traveling
C
spent; to travel
D
took; to circle