A.I don’t know for sure
B.You can count on it
C.You can believe him
D.It depends
A.No, thanks.
B.I'm very busy now.
C.At about 5:30.
D.I don't need to go there.
A.shall
B.must
C.may
D.can
A.nothing
B.everything
C.something
D.anything
A.through
B.down
C.on
D.over
A、You’re welcome
B、Thank you
C、Sorry, I don’t know
D、Just the work of a secretary
A.a thing
B.something
C.things
D.nothing