It was ten years ago__________he was put into prison because he fought against the government.
| A．that | B．since | C．when | D．before |
―I think it’s too late to apologize to Kate.
―Never mind. _______.
| A．Good medicine tastes bitter |
| B．Better late than ever |
| C．All good things come to an end |
| D．A man becomes learned by asking questions |
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 |