Choose the correct words

1. Anna's hair is bright red. She
   [must|can] have dyed it.
2. It's possible that Jennifer
   [could|must] get a perm.
3. Jack says he
   [can|may] shave off his beard because his wife doesn't like it.
4. Pam
   [can't|mustn't] have gone to the hairdresser's. Her car is parked outside her house.
5. Richard
   [must|can] be exhausted. He's gone to take a nap.
6. Sue says she
   [might|must] have cosmetic surgery, but she isn't sure.
7. That
   [can't|mustn't] be Timothy. He's got a moustache.