Ex1:
1. Yes, they've just tidied it.
2. It's ready made.
3. Sorry, someone has eaten it.
4. Yes, I have checked her answers.
5. Yes, I've rung him.
Ex2:
(1) I haven't started it yet.
(2) I have just seen Andrew
(3) He has already done
(4) I haven't finished my plan yet
(5) You have already begun
(6) We have already spent
(7) I haven't done any real work yet.
(8) I have just realized
(9) I have just decided
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