Mary must keep her mind on her medical studies now, so it would be years ______ she could think about marriage.
| A．before | B．when | C．since | D．until |
Tony, mind your manners. Don’t _______ while others are talking.
| A．cut in | B．cut off | C．cut down | D．cut up |
The companies are working together to createthey hope will be the best means o
f transport in the 21st century.
| A．which | B．that | C．what | D．who |
The hotel wasn’t particularly good. But I ____ in many worse hotels.
A .was staying B, stayed C. would stay D. had stayed
Scientists are trying to develop a special material, _______ they will make use of in space.
| A．it | B．that | C．what | D．one |
The education of _______young is always _______ hot and serious topic in modern society.
| A．the; / | B．a; the | C．/; the | D．the; a |