You look tired.You should lie down and rest for _____ hours.

You look tired.You should lie down and rest for _____ hours.
A.a little
B.little
C.few
D.a few
--Do you need ______ a doctor?
--No,thanks,I'm feeling much better now.
A.looking at
B.seeing
C.to look at
D.to see
--Why don't you let Sue do it?
--I ______ she ________ do it.
A.think,can
B.think,can't
C.don't think,can
D.don't think,can't