No one knows how the huge rocks and ___ without our modern machines eight hundred years ago.
| A．are cut; moved | B．were cut; move |
| C．are cut; moving | D．were cut; moved |
_____ of the teachers are women in our school.
| A．Two third | B．Two threes | C．Two thirds | D．Second three |
We must plant more trees after we _____ every year.
| A．cut off them | B．cut them off |
| C．cut down them | D．cut them down |
The supermarket provides customers _____ plastic bags for free.
| A．on | B．with | C．of | D．in |
I think it’s good _____ us _____ eat healthy food.
| A．for; to | B．for; for | C．to; for | D．to; to |
——We really shouldn’t use plastic bags any more when shopping.
——_____ It’s important to protect our environment.
| A．So do I. | B．With pleasure. |
| C．That’s OK. | D．So it is. |