Their products enjoy 30 percent ________ of the market in this country because both the quality and their service are fine.

In 1986, the Chinese government ________ a law stating that by the year 2000 every Chinese child would have nine years of compulsory education.

Have you ever wondered why some of the smartest students in your class sometimes ________ failing exams?

When first ________ to the market, the computer software ． was not a success due to its complexity in operation.

—How long will it be ________ the 30th Olympic Games is held in London?

—It won't be two years, I think.

I was watching the news on TV ________ the power went off.

QQ, ________ you can chat with your friends, makes communication easy.

Everyone in our class was working hard and doing what we could ________ a good university.

She is a crazy fan of this singer. ________ she listens to his songs hundreds of times, she will never get tired.

The islands developed on their own for 80 million years and ________ have many rare animals found nowhere else.