On page 34. 7 Complete the sentences about the UK with must, mustn't, should or shouldn't. IN THE UK... plete the you must be over 17 to drive a car. you?... buy a licence for your television. you ?... say 'please' and 'thank you' as much as you can. you 4 walk or sit on the grass in some parks. you give your seat to old people on a crowded bus or train. you take a present if someone invites you to their house. you open an umbrella inside the house. you call your teacher by his or her first name. rks.