I rang the bell for a long time last night, but no one opened the door.— Oh, the family __________ a party and they didn’t hear the bell.

It is impossible for anyone_________ them before, because Mr．Newman had them developed today．

Who do you intend to have______your computer? —– I haven’t decided yet. I wonder if you could help me。

Has your brother ever been to the Sand Lake?––Yes, he has _______ the Sand Lake many times.

I think _________ of the materials I listened to at the beginning of the exam __________ easy.