Can you see the boys________football on the playground?They are my classmates．
A．to play
B．playing
C．plays
D．played
The Greens used to live in London and now they________in Beijing．
A．used to live
B．are used to live
C．are used to living
D．are used for living
—What’s the matter________your computer?
—It doesn’t work．
A．about
B．for
C．on
D．with
The problem is________difficult that nobody can work it out．
A．such
B．very
C．so
D．pretty
—Smoking is bad for your health．
—You’re right．I decide to________．
A．take it down
B．find it out
C．turn it off
D．give it up
—How did he use to go to school?
—By bike．But now he’s used to________to school．
A．walked
B．walks
C．walk
D．walking
