Some people who don't like to talk much are not necessarily shy；theyjust be quiet people.
| A． | must | B． |
may
|
C． | should | D． | would |
The government has taken some measures to prevent more trees from _____.
| A．cutting down | B．cut down. |
| C．being cut down | D．been cut down |
Susan, _____ university student from Europe, teaches me _____ art in her spare time.
| A．an; / | B．a; the | C．an; the | D．a; / |
It was the first time Mary _____ such a big opening ceremony.
| A．has attended | B．attended | C．had attended | D．should attend |
Today Bob contradicted Ms. Li, our math teacher, in class, _____ made her angry with him.
| A．that | B．which | C．what | D．who |
Many things that were once considered useful and _____, for example, tobacco, is now thought harmful.
| A．beneficial | B．suitable | C．fulfilling | D．accessible |