单项选择题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.单项选择题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.单项选择题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.单项选择题The refrigerator is()we must buy some food.

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

4.单项选择题These plants are rather difficult()

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

5.单项选择题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

6.单项选择题They walked()the woods.

A.up
B.down
C.through
D.over

7.单项选择题It was well known that Thomas Edison()the electric lamp.

A.invented
B.discovered
C.found
D.developed

9.单项选择题The teacher spoke so fast that it was hard for the students to()what he was saying.

A.take in
B.take out
C.take up
D.take over