1. Parents should cooperate with teachers and ______ themselves in their children’s education.
A. get
B. involve
C. find
D. keep
2. It was not until midnight ______ they reached the camp site.
A. that
B. when
C. while
D. as
3. This record will help your officer ______ what his problem is.
A. bring up
B. put on
C. find out
D. take in
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