You ________ wear a helmet while riding a bike. (✓ )
Must
We ________ study for the exam next week. (✓ )
have to
They ________ be at the airport by 7 am tomorrow. (✓ )
Have to
You ________ eat a lot of junk food if you want to be healthy. (x)
must not/musn't
He ________ forget his passport when he travels abroad. (x)
must not / mustn't
We ________ be quiet during the movie. (✓ )
have to
She ________ go to bed early because she has an early class tomorrow. (✓ )
Must
You ________ talk with your mouth full. (x)
Must not/ Musn't
We ________ be on time for the meeting. (✓ )
Have to
I _____ study for my exams this weekend. (✓ )
Must
I _____________ forget to call my mom on her birthday. (x)
Must not/ Musn't
The doctor said that I _____________ exercise regularly to stay healthy. (✓ )
Must
