Good morning. I want to buy two ____.—OK. Here you are.

eens are smoking in Beijing, ______ the number of primary and middle school students picking up the habit has more than doubled from previous years.

If you insist on continuing like this, I think you take a risk of________to leave the company. [ ]

No matter _____great progress you have made in your studies, you should continue to work hard.[ ]

Scientists show us that __________ you use your brains， ___________ it will be.