When we were young, every evening my brother and I ______ stay at home waiting for our mother.

Had it not been for the haze（霾）weather phenomenon, there fewer car accidents in Beijing then．

Nowadays college graduates have to be highly______ to find an ideal job.

It was great joy ________ he received the news that his lost daughter had been found

When will you hand in your homework—Sorry, I’m not sure. I _______writing it yet.