Mark was a student at this university from 1999 to 2003, ____ , he studied very hard and was made Chairman of the Students' Union.
| A．during which time | B．for which time | C．during whose time | D．by that time |
So hard _______ that he can go to an ideal university.
| A．studied Tom | B．did Tom study |
| C．does Tom studay | D．studies Tom |
QQ, ______you can chat with your friends, makes communication easy.
| A．why | B．which | C．that | D．where |
These tax laws which are intended for domestic companies do not _____ to foreign companies.
| A．contribute | B．lead | C．apply | D．fit |
The film is very humorous but______can be enjoyed unless you understand English culture.
| A．everything | B．something | C．nothing | D．anything |
---Your composition is full of mistakes.
---I wish I______more careful.
| A．would have been | B．had been | C．would be | D．were |