1)

1.were
2.was
3.were
4.was
5.was
6.was

2)

1.Was Science the first lesson?
2.Were the boys late?
3.Where were the girls?
4.What lesson was second?
5.Were the sums easy?
6.When was their Maths lesson?

3)

1.No.The boys weren't noise.
2.No.The lesson wasn't difficult.
3.No.The weather wasn't cold.
4.No.We weren't in the park.
5.No .The children weren't quiet.
6.No.The teacher wasn't a man.