Some of the sentences are incorrect. Rewrite them correctly if necessary

Some of the sentences are incorrect. Rewrite them correctly if necessary .
1 I didn't hear this band before. Who are they?
2 Callum's still off school. He was ill for over a week.
3 Have you finished your homework last night?
4 Hannah got a new laptop for her last birthday.
5 I've sprained my wrist so I can't do my exams.
6 Did you take your driving test yet?
7 Leon has broken his leg while he was playing rugby.
8 We're hungry! We didn't eat since breakfast!