The plane takes off at 6:00 p.m. So I have to arrive at the airport ________ 5:30 p.m. at the latest.A after B. since C. until D. by
When we were young, every evening my brother and I ______ stay at home waiting for our mother.
______ I’m well again, I can go on with my work.
The government has to close those small factories to prevent the water of the river ______.
We agreed to accept ___________ they thought was the best engineer.
------Would you mind me smoking here? ------- ______. It’s non-smoking area here.