—It’s a long time ________ I saw you last.—Yes,and what a pity it is now that it will be a long time ________ we see each other again.
Although the plan hasn’t been approved______ present, he insists______ carrying it out.
Last Monday, I bought a second-hand computer, ______ was very slow.
The lecture hall______ by Doctor Li in the 1980s can contain at most 6,000 people.
That day, we______ for the train station when Tom fell and hurt his legs badly.
Mr Smith closed all the windows while driving______ he wouldn’t catch a cold.