( )6.Tom _____bread in his bag.

( )6.Tom _____bread in his bag.
A.have some
B.has many
C.hasn't any
D.haven't many
( )18.Hello,can I speak to Mike?__________
A.Yes ,you can.
B.Speaking
C.Yes,I'm Mike.
D.Yes,I'm him.
( )19.There's _________bread on the table.
A.a
B.an
C.some
D.any
( )20.Please give me a pen and a pencil,_________.
A.either
B.to
C.too
D.two请问这几道题应该怎么选?为什么?