单项选择题
Please leave the key under the door（）you go out.
A.in case B.in the case C.in case of D.in the case of
单项选择题 We have kept（）our friendship by writing to each other, so we are true friends.
单项选择题 It（）that I met one of my old classmates on my way home yesterday.
单项选择题 We advised him to give up smoking,（）a lot of exercise.
