单项选择题
A.in case B.in the case C.in case of D.in the case of
We have kept（）our friendship by writing to each other, ...
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
It（）that I met one of my old classmates on my way home ...
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
We advised him to give up smoking,（）a lot of exercise.A...
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
