--How much pepper did you put in the soup?
--I'm sorry to say, ____. I forget.
| A．no one | B．none | C．nothing | D．no |
While watching television,__________.
| A．the doorbell rang | B．the doorbell rings |
| C．we heard the doorbell ring | D．we heard the door bell rings |
. Many experts agree that once these treasures are _______ to the air, great harm will be done to them. So they think it better not to unearth the treasures.
| A．exposed | B．threatened | C．constructed | D．conserved |
We agreed ______her but so far she hasn’t turned up yet.
| A．having met | B．meeting | C．to meet | D．to have met |
---If you’re driving to________airport, could you please give me _______lift?
---- Get in, please.
| A．an; a | B．the ;a | C．the; the | D．an; the |
. I still remember _______to the Great Wall and what I saw there.
| A．To take | B．to be taken | C．taking | D．being taken |