--- She will finish the project within three days!

--- ______! I could do it in three hours.

The rising house price and the high income tax rate have become the biggest ______ of the ordinary people in China today．

It is one thing to enjoy listening to good music, but it is quite ______ to perform skillfully yourself.

I appreciate ______ the opportunity to work in your company two years ago.

If you want to see Mr. Johnson on Friday morning, make sure he is ______ ahead of time.

--- Could we accomplish the task according to the schedule?

--- I doubt that. The problem remains ______ we can get financial aid within this week.

He works very hard in order to get himself ______ into a key university.

You will have to stay at home all day ______ you finish all your homework.

I have to reschedule the appointment with you since there is a ______ in my arrangement.

---When shall we start the reconstruction of the historic building?

--- Not until our program ______ by the authority.