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appeared had appeared have appeared were appearing
A number of;are The number of;are A number of;is The number of;is
appeared had appeared have appeared were appearing
A.number of, are The number of, are A.number of, is The number of, is
Sing singing sings are singing
A number of;are The number of;are A number of;is The number of;is
through cross across over
went on went over went down went out
A.number of, are The number of, are A.number of, is The number of, is