Question

4. They... do their homework today because it is a holiday at school. a) Must not b) don't have c) don't have to 5. He is terribly fat. He ... eat too much. . a) Should b) mustn't c) have to​

Answer 1

4 - dont have to

5 - mustn’t

Answer 2

4. The correct answer is c) don't have to.

This means that they are not required or obligated to do their homework today because it is a holiday at school. It is their choice whether or not they want to do it.

5. The correct answer is a) should.

This means that he is advised or recommended to eat less because he is terribly fat. It is suggested that he should make healthier food choices and reduce his intake in order to improve his weight and overall health.