Must /Must not

You_____ride bicycles in the park. it is dangerous.

• must not

• must

• can

• have

You_____turn off your mobile phones in the theater.

• cannot

• must

• can't

• must not

You must not_____ with fire.

• playing

• played

• plays

• play

You must ______rubbish in the rubbish bin.

• throws

• throw

• threw

• throwing

The baby is sleeping. You must not _______.

• shout

• shouts

• shouted

• shouting

You________listen to your teachers.

• must to

• must

• mustn't

• must not

You must not _______ on the grass.

• walking

• walks

• walk

• walked

You ________keep quiet in the hospital.

• must

• must not

• mustn't

• cannot

You ______pick the flowers.

• must

• mustn't

You must ________the classroom clean.

• keep

• keeps

• kept

• keeping