选词填空。 1. The birds are ________________ ( sing , singing ). 2. Are these mom’s ________________ ( sock , socks ) ? I don’t know. 3. Is that __________ ( your , yours ) coat ? No, it’s not __________ ( my , mine ). 4. _________ ( Our , Ours ) shoes are blue. _________ ( Their, Theirs ) are brown. 5. Tony wants _____________ ( be , to be ) a firefighter. 6. The writers _____________ ( have , has ) ten red balloons.
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