---What are you going to do this weekend ?--- Well, we’ll clean up the city parks ________ it rains..
I called Mary many times yesterday evening. But I couldn’t get through. Her brother _____ on the phone all the time.
——I haven’t got a camera.——I think you should buy_______. It’s useful for you.
——Don’t put the bike_______the teaching building.——Sorry, I won’t.
_____ people in the world are sending are receiving e-mails every day.
I have never heard______.