Match the fact and the reasons that can / could /

Match the fact and the reasons that can / could / may / might / must have caused them.
1 I worry about Tom. He didnt call yesterday to tell us about the exam result.
2 Jack was superb during the History Contest! He seemed to know so much about medieval times!
3 Theres an email from Jimmy. He wants us to come to the laboratory immediately!
4 Jenny took part in the archaeological expedition last summer.
5 Look, this is James key, isnt it?
6 I cant find my passport anywhere. I havent got the slightest idea on where it can be.
a) He may have completed his experimental work and wants to demonstrate the results.
b) Theres no need to worry. He must have passed it. He would have called us otherwise.
c) Looks like that. He may have lost it during our PE class.
d) Yeah, he sounded impressive. He must have read lots of literature on the topic.
e) You could have left it in the library. You might have got it out from your bag to fill the number in the form. Lets call them and ask.
f) That makes me feel envious. That must have been an unforgettable experience.