Here are the other 3 phrases. Thank you. I need to know if the tenses are possible.

3) When I arrived at school, I met some of my friends/ the teacher was speaking/ the lessons had already started/ I realized I had left my book at home.
4) I had lunch and then I got rest (I had a rest?),/ I got ready to go out/ I did my homework (past simple)
5) While my family was abroad/ wasn't at home/ was eating!, was leaving/was talking/ went out (mistake!), had gone to the cinema (mistake!), I called a friend.

4. then I rested

It appears that all are OK, but then again, I get confused with all the choices!

Sra