A.So
B.Since
C.If
D.While
A.closed down
B.put down
C.went down
D.knocked down
A.hadn’t
B.wouldn’t have
C.shouldn’t have
D.haven’t
A.No, I already have plans
B.Thanks a lot but I’m busy tonight
C.No, I really don’t like being with you
D.I’m ill, so I shouldn’t go out for dinner
A.in
B.to
C.at
D.on
A.a so difficult job
B.such a difficult job
C.so a difficult job
D.such difficult a job
A.that, which
B.which, that
C.what, as
D.that, that
A.grateful
B.helpful
C.skillful
D.hopeful