Безотлагательно!! Помогите написать в Past Continuous or Past Simple.1. he sit

Срочно!! Помогите написать в Past Continuous or Past Simple.
1. he \ sit down \ on a chair \ while \ I \ paint \ it
2. as \ he \ run \ for a bus \ he \ collide \ with a lamppost
3. his hair \ catch \ fire \ when \ he \ cook \ chips
4. when \ he \ hold \ a beautiful vase \ he \ suddenly \ drop \ it
5. he \ sit \ in the garden \ when \ a wasp \ sting \ him \ on the nose