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21.He talked about his experience during the war. But he left
（ ）
a lot of interesting details.
A. about
B. over
C. out
D. behind
22.In her first year Jane happened to share a room with a woman who was
（ ）
against people from other races.
A. prejudiced
B. fought
C. disgusted
D. protested
23.When the weather is warm she keeps the window open
（ ）
let fresh air in.
A. as to
B. so as to
C. only to
D. about to
24.They knew if they could not get across the river that night, they would be
（ ）
real trouble.
A. in
B. into
C. at
D. among
25.Mark woke up one morning to find both water and electricity
（ ）
because he had not been able to pay the bills.
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