1) Carol looks very happy. She ... her Math test.  a) may have passed b) must have passed 2) The new assistant hasn't arrived yet. He ... the wrong train.  a) may have taken b) can't have taken 3) You ... sick yesterday. I saw you talking to our Geography teacher...  a) must have been b) can't have been 4) I didn't pass my Literature test. I ... more.  a) can have practised b) should have practised 5) I ... a teacher, but I decided to become a vet. And, I'm happy with my choice! a) could have been b) must have been 6) You ... to the school trip, it was awesome. We learned a lot about Italy! a) should have come b) may have come 7) The astronomy teacher ... his job . I saw him in his office.  a) shouldn't have left b) can't have left 8) I'm sorry , I forgot to tell you my sister was coming . I ... you a message.  a) should have sent b) can't have sent 9) Lucy didn't study the lesson. She ... tired. That's unusual. She's very responsible! .  a) may have been b) can't have been 10) He knows a lot about medieval times. He ... a lot about it. a) must have read b) should have read

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