_____March 20____26, the US first lady Michelle Obama was on a trip to China with her daughters and mother.
#45878
A
Between…and
B
From…to
C
By…to
D
On…to
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It’s difficult for such a girl to swim ____ the river.
#50697
A
cross
B
across
C
crossing
D
crossed
Tom often helps me ______ my English. 
#48368
A
with
B
for
C
by
D
of
 I’m sorry I took your backpack______ .
#51332
A
because mistake
B
with mistake
C
by mistake
D
by mistakes