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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