Answer:
1. b You might have left it at school.
2. c You can't have sent it to the right address.
3. c He can't have taken his phone to work.
Dialogue:
Number one
Bill: I can't find my camera.
Ben: <u>You might have left it at school.</u>
Bill: Yes, maybe. I'll look there tomorrow.
Number two
Alex: She didn't get my email.
Kat: <u>You can't have sent it to the right address.</u>
Alex: I'm sure I did. I checked before I sent it.
Number three
Clare: My dad wasn't answering his phone.
Liz: <u>He can't have taken his phone to work.</u>
Clare: But he always has it.