- How long did David work here?
- For half a year, he didn't leave much_______on us.

I soon found that the work I was doing had already been done by someone else.________，I was wasting my time.

—Do you have anything planned for this afternoon?
　 —Yes. I’m going to ________a famous NBA player.

Most parents think that computer games have a bad _______ on their children．

Webster        his American Dictionary of the English Language, which first appeared in 1828.

My chest _______ when I make a deep breath, doctor.

You must keep us ______ of how things are going here.

--- How can I repair it?
--- Well, look at the _________.

Talking about his success, the famous scientist said, “I’ve been lucky ______ there are many people who have helped me”.

After a year's training, I'm sure he will _______ the target.