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a) I'm sure that David took your books by mistake.
b) It was a mistake to park outside the police station.
c) It was unnecessary for you to clean the floor.
d) I'm sure that Liz hasn't met Harry before.
e) Ann possibly hasn't left yet.
f) I'm sure they haven't eaten all the food. It's not possible!
g) Jack is supposed to have arrived half an hour ago.
h) Perhaps Pam and Tim decided not to come.
i) I think it was the cat that took the fish from the table!
j) It was a waste of time worrying, after all!

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