Every possible means __to prevent the air pollution, but the sky is still not clear.
| A．are being used | B．have been used |
| C．has been used | D．had been used |
—I have some big news for you. You’ve been accepted as a member of our club.
—_______ That’s great!
| A．Have I ? | B．Pardon? |
| C．Congratulations! | D．Good idea! |
________comfortably in his chair, the old man enjoyed music with his eyes half_________.
| A．Seated, closed | B．sat, closing | C．seating,closed | D．sitting,close |
You have to reorganize your article to make it _______.
| A．understand | B．represent | C．make sense | D．stand for |
If you __ go, at least wait until the storm is over．
| A．can | B．may | C．must | D．will |
It is human activities on the earth that are to _______ global warming.
| A．be blamed for | B．to blame for | C．take charge of | D．be responsible with |