You ______ wear a helmet when riding a bicycle for safety.

Students ______ use their phones during a test.

It is raining outside, so you ______ bring an umbrella.

You ______ borrow a book from the library if you have a library card.

You ______ finish your homework before you can play video games.

You ______ touch the exhibits in the museum.

We ______ be quiet in the library.

You ______ eat if you are not hungry.

She ______ go to the doctor because she has a fever.

You ______ park here; it's a no-parking zone.

Children ______ be supervised by an adult at the swimming pool.

You ______ wear a uniform to school if there is no dress code.

He ______ study hard if he wants to pass the exam.

You ______ be 18 years old to vote in most countries.

You ______ leave your valuables unattended.

She ______ help her mother with the chores.

You ______ apologize if you make a mistake.

They ______ enter the building without permission.

You ______ wear a coat if it's cold outside.

He ______ drive a car because he is only 15.