Sound travels ______ air ______ a speed of about 340 metres per second.
#47987
A
over; in
B
through; at
C
by; at
D
through; over
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Tom did all _____he could to get on well _____his classmates.
#50562
A
which; with
B
that; /
C
that; with
D
/; /
---How long have you been learning Japanese? ---I’ve been learning it ____________.
#48994
A
when I was 10 years old
B
since 10 years ago
C
for 10 years old
D
in 10 years