—How can I learn English well?—You will learn it well ________ you practice speaking it often. 
#56660
A
unless
B
as for
C
as soon as
D
as long as
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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
 I will wait here ____ the concert is over.
#58456
A
by
B
when
C
until
D
as