-- I’m still working on my project. -- Oh, you’ll miss the deadline. Time is __________.

The great achievements in recent 30 years have proved that the reform and open policy is a vital measure that ________ the national conditions of China.

Father asked me to practice ___ English every morning.

You must ______ a wide vocabulary if you want to learn a language well. 

Today country music can _____between 200 and 400 million dollars a year.