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16£®It is more difficult ____old people ____learn English.

    A.to ; for                   B.to; to               Cfor ;for.                  Dfor; to.

17£®This match is _____than that one.

    A.more interesting               B.interesting .         C.interested                  D.more interested

18£®Is your brother good at______?

    A. run                         B. runs                 C.to run                      D running