Определить Past Simple or Past Perfect

I
1)I had just finished writing my essay when Laura phoned.
2)By the time I got to the supermarket, it had already closed.
3)I had done all the homework before my parents returned.
4)Jason opened the window. A white sheet of snow had covered the ground.
5)Sue called me to say that they had not bought the necessary sportswear yet.
6)Mrs. Wilson had been to the bank before her husband returned from work.
7)Jane felt really bad because she had put on weight.
8)Barbara became slim after she had joined the athletic club.
9)Doris arrived at the airport early because she had caught a taxi.
10)As soon as rain had stopped, there appeared a rainbow in the sky.

II
1)When I got to the Party, it had already started raining.
2)Molly went to see her granny but the old lady had gone shopping
3)After Mary had won the race, she became famous.
4)The children ran into their playground and saw that the storm had ruined everything on it.
5)When we met, John had already done everything for our next class.
6)Yesterday we started our training only after Harris had returned.
7)After Tom had climbed the rock, he felt satisfied.
8)As soon as I had finished writing the essay, the bell rang
9)The teacher had explained the material by the time I came in.
10)When Sandra came home, her mother had made a very nice dinner