Ответ:

1.1)they've just tidied it

2)he has just made it

3)sorry, I've just eaten it

4)yes, she has just checked them

5)yes, I've just rung her

2.

1 I haven't started it yet.

2 I have just seen Andrew.

3 he has already done

4 I have not finished my plan yet.

5 have you already begun

6 we have already spent

7 I have not done any real work yet

8 I have just realized

9 I have just decided

3.1. He hasn't had any fun for a long time.

вроде