21£®According to         World Health Organization, health care plans are needed in all countries to prevent        spread of the flu.

       A£®the; the               B£®the ; /                  C£®/; the                   D£®/; a

22£®In Beijing Mr. Smith was so struck       the beauty of nature that he decided to stay    

    another two nights.

       A£®with; in               B£®at, on                  C£®by; for                D£®to; on

23£®—Do you know when she          back to China?

—No, but I’ll call you the moment she        back.

       A£®will come; will come                           B£®come; comes

       C£®will come; comes.                                                               D£®comes; will come