exercises could you answer

[samsat456]

correct these sentences if they are already correct if necessary:
-1tony computers have been stolen
2-when the teacher had called out the girl's names, they all stepped forward
3-we had to study charles dicken's early novels at school
4-i went to the newsagent's to buy a paper
5-there were hundreds of bird's nests in the trees
6-they're my mother-in-law's favourite sweets
i met a cosin of the duke of edinburgh last week-