21．—Excuse me, Sir! Could you tell me the way to Tianfu Square?
—Sorry, but I’m a stranger here as well.
—_________.
A．Thanks, anyway. B．It doesn’t matter.
C．Never mind. D．No problem.
22．The number of people in the world _________ about 6 billion and large quantities of waste ________each year.
A．total; has been produced B．totals; is produced
C．totals; are produced D．total; are being produced
23．No tricks are allowed ____ the performers are skilled enough to perform safely.
A．unless B．if C．once D．after
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