According to a research, smoking is bad for our health.—Yes, especially for teenagers. Students _______ to smoke.

r to find _______ better job, he decided to study _________ second foreignlanguage

When solving the problem a second time, you’d better be more careful____you made a mistake

He once studied in Zhejiang University, ________he went abroad for further study.

do you think of store shopping in the future—- Personally, I think it will exist along with homeshopping but___________