Lishen!Is Tom singing in the classroom?No,it __ be Tom.He has gone to Paris.

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• Lishen!Is Tom singing in the classroom?No,it __ be Tom.He has gone to Paris.
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• parents often tell us not ___alon in the river in summer.Our parents often tell us not ___alon in the river in summer.A swimB to swim C swimming--Listen!Is Tom singing in the classroom?--No.It___be Tom .He has gone to Paris.A may not B need not C can not
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