---Did you get there by _____bike? --- No, I took _____taxi.
——TV and computer are so popular these days.——Yes, they can ____ our eyes to the outside world.
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.