We_______on this project for four hours. Let’s have a rest.
| A．are working | B．have been working | C．worked | D．had worked |
They____________ potatoes in different ways. They can boil them and fry them.
| A．cook | B．eat | C．make | D．take |
She likes to keep things rather than throw them ____.
| A．out. | B．off | C．down | D．away |
It was 4 o'clock when the front doorbell rang. Mrs. Clarke was __________ tea at the time.
| A．cooking | B．making | C．burning | D．serving |
The general asked his men to push _____ so they might overtake the retreating (败退的) enemy troop.
| A．out | B．over | C．on | D．off |
However, it only appears in the imagination and will never be __________.
| A．realized | B．supported | C．understood | D．produced |