As is known to all, theory is based on practice and _____ serves practice.
#70919
A
in hand
B
in turn
C
in return
D
in exchange
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If you leave the club, you will not be _____   back in . 
#81873
A
received
B
admitted
C
turned
D
moved
When   the future, many people will imagine a life    high-tech devices.
#70898
A
thinking of, full of
B
thought about, full of
C
thought of, filled with
D
thinking about, filled with