of our classmates are good at basketball.
| A．Three quarters | B．Three fourth |
| C．Third four | D．Three four |
__________ by a greater demand of vegetables, farmers have built more green houses.
| A．Driven | B．Being driven |
| C．To drive | D．Having driven |
The flowers his friend gave him will die unless __________ every day.
| A．watered | B．watering |
| C．water | D．to water |
Please remain __________ until the plane has come to a complete stop.
| A．to seat | B．to be seated |
| C．seating | D．seated |
Jenny hopes that Mr. Smith will suggest a good way to have her written English __________ in a short period.
| A．improved | B．improving |
| C．to improve | D．improve |
— Did Peter fix the computer himself?
— He __________, because he doesn’t know much about computers.
| A．has it fixed | B．had fixed it |
| C．had it fixed | D．fixed it |