Circle the mistakes then correct them (1 mark):
1.Students shouldn't to cheat in exams.
2.Mary is have a big party for her ${12}^{th}$ birthday next Saturday.
3.We have to do a lot of homeworks after school.
4.Tom is a hard-working student. He spends most of the time to study.
5.My little sister is very creative. She good at draw pictures.