Mr．White taught math last term．
| A．your | B．they | C．us | D．hers |
All passengers______go through safety check before they take a plane.
| A．can | B．may |
| C．must | D．ought |
_____ carefully, Michael! There’s a school ahead.
| A．Drive | B．To drive |
| C．Drove | D．Driving |
Air pollution has become__________ than ever before. We must do something to stop it.
| A．serious | B．more serious |
| C．most serious | D．the most serious |
Old Mr. Black lives happily with his three dogs.of them are part of his family.
| A．Both | B．All |
| C．None | D．Neither |
—can you finish the report on food safety?
— In two days.
| A．How far | B．How much |
| C．How often | D．How soon |