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
Do you know the man________is talking with the teacher?
A．which
B．whose
C．who
D．whom
My pocket money________，so I wanted to find a part－time job to get more money．
A．ran out
B．went out
C．got out
D．ran away
He was badly ill，but he kept on________until 2:00 a.m．
A．work
B．working
C．worked
D．to work
