Giving advice or Stating rule

You _____ work hard if you want to get good marks.

You _____ have consulted a doctor.

You _____ swim in the river, the current is very fast.

Passengers _____ fasten their seat belts.

You _____ show your passport or identity card to get on a plane.

You _____ use your handphone during exam.

You _____ always get enough sleep before driving a car.

You _____ rest and drink lots of liquids if you have a cold.

You _____ arrive at the airport early in case there are delays.

You _____ be seventeen to drive a car in Indonesia.