Mark was a student at this university from 1999 to 2003, ____ , he studied very hard and was made Chairman of the Students' Union.
277. If you want to get there quickly, you'd better take the track in the forest. The underlined word means ____.
276. We should take good care of our ____. Don’t forget to rinse your mouth after meals.
275. A telephone is an instrument by which we can speak to people far away. The underlined word means ____.
274. Believe it or not, two ____ is worth an egg.
273. Which of the following is not a container?