Вставьте пожалуйста по смыслу эквиваленты have to, is to, can, must?!
1) Ann.... come at 10 am to day. The manager permitted her.
2) Are you using the mobile ..... I take it?
3) You really...... work harder if you want to pass the exam
4) I'm sorry. I ..... go now.
I ...... meet the manager in 10 minutes