I haven’t finished my composition. I ________ for two hours and a half.

When will you return the book to me—I’ll give it to you _________ I finish it.

I’m afraid I’ve got a bad cold. –_______.

The first time I ________ here, it was the year of 1980; this is the third time that I _________ to Chongqing

I’m leaving for Canada tomorrow. My plane leaves at 6:00 tomorrow morning.—_________