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單項選擇題

Jane likes singing. We often hear her（）after class

A.sing
B.to sing
C.sings
D.sang

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James Watt（）the steam engine.

A.was inventing
B.invented
C.had invented
D.has invented

單項選擇題

It is（）to interrupt the others while they are talking.

A.rough
B.rude
C.polite
D.troublesome