第一部分:单项选择—Make sure you have turned off the air conditioners before going out.—_______________.
What the teacher said in class set all the _____ a lot.
By the time I _____the railway station, the train _____.
_____ teaching in a university, he also spent some time teaching in a night school.
Why do you want a new job_____ you've got such a good one already?
I couldn’t get to sleep, but _____ all night.