— John, could you please the black-board now? It’s your duty today.
— OK. I’ll do it right away.
| A．not to clean | B．to clean | C．not clean | D．clean |
— You used to the bus to school, didn’t you?
— Yes, I did. However, I am used to to school now.
| A．take; walk | B．take; walking | C．taking; walking | D．taking; walk |
— What other rules do you have in your class?
— Each student has to a composition once a week.
| A．hand in | B．hand up | C．hand over | D．hand out |
We needn’t hurry all the way to the airport — the flight has been because of the bad weather.
| A．put on | B．put off | C．put away | D．put up |
— What happened?
— The owner changed his mind and refused his house.
| A．sell | B．sold | C．selling | D．to sell |