Помогите  с английским! Изберите верный модальный глагол. 1. Mother is ill,

Помогите с английским!
Изберите верный модальный глагол.
1. Mother is ill, and I have to / must take my sister to school.
2. Tomorrow I shall be free and I can /shall be able to help you.
3. You may / might take any book you like.
4. It was a very, important meeting and we should / had to attend it. Thats why we returned home late.
5. The authors of the project will be able / should to minimize the space for the communication system.