相关题目
Professor Smith is also the （ ）of the international program office. If you have any problem when you study here, you may go to him for help.
The college students in China are （ ）from smoking on campus because this will do them no good.
After working for twenty hours without any rest, the doctors were （ ）.
Free medical service is （ ）to nearly all the college students in China.
Pine trees are usually believed to （ ）cold weather.
The engineers in this lab spent several weeks （ ）their plans for the new bicycle.
Many kinds of animals are believed to have （ ）from the earth.
The （ ）work continued for more than a week but there was still no sign of the missing boy.
He （ ）to study harder in the future so that he could have more opportunities to find a better job.
He tried to （ ）relations with his former wife but he failed.
