Our classroom must______every day.
A. clean B. be cleaned C. is cleaned
The boy always makes _______ cry.
A. she B. her C. hers
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 |