Using modals of obligation

Select the correct answers to complete each sentence.

Children _________ be polite to adults.

Most children _________ watch TV after they have finished their homework as a reward for working hard.

Motorists _______ have a valid driver’s licence in order to legally drive a car.

Students ________ spend plenty of time revising before an examination if they want to achieve good marks.

Visitors _______ enter restricted areas without permission.

Drivers _______ stop at traffic lights if they are on red.

Since it can be annoying to others, passengers _______ talk loudly on their mobile phone whilst using public transport.

Since both countries are part of the U.K., people travelling from England to Scotland ________ show their passport when going over the border between the two countries.