4.— The National College Entrance Examination is drawing near. All we should do is make the best use of time.
— I can’t agree more. Every minute ________.
A.needs B.counts C.acquires D.urges
5.— I phoned you yesterday morning. A girl answered, but I didn’t recognize the voice.
— Oh, it __________ my younger sister. She was in my room at that moment.
A.must have been B.should have been
C.could have been D.may have been
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