That ____________ be true. I don't believe it.

1. A.
   can
2. B.
   needn't
3. C.
   can't
4. D.
   must

That ________ be ________ display.

1. A.
   mustn't, for
2. B.
   can't, for
3. C.
   may not, on
4. D.
   can't, on

 That _____ be his book because his name is on it.

A. can       B. may         C. must         D. would

That ________ be ________ display.

[　　]

A．mustn't, for

B．can't, for

C．may not, on

D．can't, on