——How _______ is the hat， Tony?——100 yuan.
A.often B.much C.many
What’s wrong _______ you? I had a bad cold.
A.for B.to C.with
Of the three books, this one is the __________.
A.thinnest B.thinner C.thinest
Please look____the baby when I go out.
A.for B.in C.after
Tony must _____ good at ice-skating.
A.is B.be C.are