I usually do my homework after dinner until 10 pm, ______ is my bedtime.

Will you help him________ you see an old man in trouble ?

There is no doubt _________ the world climate has been changing in recent years.

The reason_______ he didn’t come was that he was injured.

We      last night, but we went to the party instead.

_______ the news, they are very happy.

When  _______ homework , you should be careful .

All I have to do is  _________my life .

_________ his work , he can’t play with his friends.

Everyone was in silence, having nothing to do but _________.