--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
In the nineteenth century, English became international language．
A．an B．a C．/ D．the
