—Would you mind opening the window?
—_______ Please do.
A.Certainly not
B. You’d better not
C. I’m afraid so
--Look! Someone ____ the floor．It's clean．
--Well，it wasn't me I went shopping just now．
| A．is sweeping | B．was sweeping |
| C．had swept | D．has swept |
I ________ be a little bit slow, but at least I don’t make foolish mistakes．
| A．should | B．may | C．must | D．need |
--- Driving on icy roads is very dangerous ! The more ice there is, the _______ down the road you have to look．You should be more careful．
--- OK, I will．
| A．more far | B．farer | C．farther | D．farthest |
China began to open to the outside world in the late 1970s．_________, there have been great changes in the country．
| A．By then | B．As a result |
| C．At last | D．In all |
— I’m afraid I can’t you, sir．Can you speak more slowly?
— Of course．
| A．follow | B．listen | C．see | D．find |