Вставьте слова
(couldn't, can, need, needn't, ought to, must)

1.It is necessary for you to have a computer password.
You.have a computer password.

2. It isn't necessary to stay in the exam hall after you have completed the test.
You.to stay in the exam hall after you have completed the test.

3.I advise you to seek help if you are having problems understanding something.
You.seek help if you are having problems understanding something.

4.Nia is a very well-behaved child. I doubt that she was nasty to the other children.
Nia is a very well-behaved child. She.nasty to the other children.

5.Richard has the ability to solve maths problems very quickly.
Richard.solve maths problems very quickly.

6.Students are obliged to be on time for class.
Students.on time for class.​​