Must & Mustn't

She is ill , so she ______________ see the doctor.

• must

• mustn't

You ______________ throw litter on the stairs.

• must

• mustn't

You ______________ make noise in the library.

• must

• mustn't

You ______________ eat fruit and vegetables.

• must

• mustn't

You ______________ be friendly to everybody.

• must

• mustn't

You ______________ brush your teeth three times a day.

• must

• mustn't

You ______________ be nice to your classmates.

• must

• mustn't

You ______________ chew gum in class.

• must

• mustn't

You ______________ fight with your classmates.

• must

• mustn't

You ______________ listen to your teacher very carefully.

• must

• mustn't