By the time I got up, my mother _______ .
| A．left | B．had left | C．has left | D．is leaving |
Tea was invented by _______ accident.
A. an B. the C. ＼
Haze weather has become common in some major cities in China. We all wonder ________.
| A．how is the air polluted |
| B．what can we do with the bad weather |
| C．why the air is polluted seriously |
| D．what are the real reasons |
---Bob, when can we watch TV?
---Not until it _______ next week.
| A．repairs | B．will be repaired |
| C．is repaired | D．will repair |
Time is the thing _____ never comes back. We should make full use of it.
| A．who | B．that | C．what | D．when |
_______role she played in the movie! That’s why she has a lot of fans.
| A．How interesting | B．How an interesting |
| C．What interesting | D．What an interesting |