When I fail and want to give up, my teacher always encourages me ___________ in myself and have confidence in myself.
| A．believe | B．believes |
| C．believing | D．to believe |
— Would you like to go to the cartoon show with me?
— It sounds like fun, ______I’m too busy.
| A．so | B．for |
| C．or | D．but |
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 |