Look !The telephone is broken .Someone damaged it ______purpose.–That may be right. But perhaps it was broken ________ accident.

Could you tell me____ about Valentine’s Day in Japan— Well, not only adults but children celebrate it.

If he ________ my advice，he wouldn’t have lost his job．[ ]

There_______a teacher and some students on the playground.

Had I known about this computer program, a huge amount of time and energy__A__.