單項選擇題We have kept（）our friendship by writing to each other, so we are true friends.

A.back
B.up
C.off
D.down


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1.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

2.單項選擇題We advised him to give up smoking,（）a lot of exercise.

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

3.單項選擇題The refrigerator is（）we must buy some food.

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

4.單項選擇題These plants are rather difficult（）

A.to look after
B.to be looked after
C.being looked after
D.looking after

5.單項選擇題The act of speaking will also help to improve listening comprehension（）

A.to some way
B.in the way
C.to some extent
D.in the extent