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單項選擇題

It（）that I met one of my old classmates on my way home yesterday.

A.took place
B.occurred
C.broke out
D.happened

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We advised him to give up smoking,（）a lot of exercise.

A.to do
B.and to do
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D.and doing

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The refrigerator is（）we must buy some food.

A.bare
B.blank
C.hollow
D.empty