The discovery of gold in California a rush to get there.
| A．set off | B．set up | C．set out | D．set in |
Having ________ every night is very important for your health.
| A．a good amount of sleeps | B．a number of sleep |
| C．a good amount of sleep | D．a great deal of sleeps |
He made three good friends in the university, ______ joined the army after graduation.
| A．one of them | B．one of whom | C．one | D．one of which |
_______ is certain, people’s living conditions in China have improved a lot since the 1980s.
| A．It | B．As | C．what | D．Which |
Humans are polluting the earth day by day, ________, of course, will cause punishment sooner or later.
| A．that | B．it | C．which | D．what |
You’d better cut your hair short. Our school doesn’t _______long hair.
| A．approve of students wore | B．approve students to wear |
| C．approve of students to wear | D．approve of students wearing |