Complete the sentences with the correct modal.

We ... to decide who will be class president. You ... do all your homework today, you can finish it tomorrow. I didn't see Lyn today, she ... have taken the day off. " ... I leave early today, please?" Sarah asked. Kate looked pale in the doctor's office. She ... be ill. " ... you move over a bit so I can sit down, please?" he asked. You ... respect your teachers and classmates. You ... talk or eat in class. She ... have watered the garden as I had already done it. Ian ... have finished his homework already, it's impossible.