-- Cross the road carefully, __________ you’ll keep yourself safe.--Thank you.
I have heard a lot of good things about you _____ I came back from abroad.
—Why didn't you try your best to get on the bus?—I tried to, but it had started moving ________ I could get on it.
—Did you call Jim back?—I don't need to, ________ we'll have a meeting together tonight.
In Britain, you must reach 18 ________ you want to drive a car.
I'll write a letter to you ________ I arrive in New York.