并说明理由

并说明理由
Bill is ill.Do you know what's wrong with him?
Poor boy.His illness is the（ ）of eating unhealthy food.
A.result B.cause
C.reason D.end
Your son doesn't get up early,does he?
( ).But he gets up late on weekends.
A.Yes,he does.B.No,he doesn't.
C.Yes,he doesn't.D.No,he does.
Take your medicine,(
A.will you B.do you
C.don't you D.shall we
All ( ) is needed is a supply of water.
A.the thing B.that
C.what D.which