We drove to the dump and were back on the _____ by 1 :00.
A.avenue
B.track
C.route
D.barrier
第3题
Sometimes very young children have trouble _____ the right from the wrong .
A.for separating
B.to separate
C.having separated
D.separating
第4题
Read aloud _____ all the students in the classroom can hear you clearly .
A.since
B.because
C.for
D.so that
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