Question

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

Answer 1

1)can
2)can
3)must 
4)have to, I'm