Complete the sentences using the words in brackets. it's good idea to take an aspirin if you have a headache( you should take an aspirin if you have a headdache 1. it's no necessary to wear a suit to work.( wear a suit to work. 2. it's a good idea to get the tickets early ( iur tickets in advance. 3. he can't home until he has switched off all the lights( all the lights before he can go home. 4. a passport is necessary to enter the country( if you want to enter the country 5. smoking is forbidden in the waiting room( in the waiting room 5. it isn't a good idea to wash your hair now. it's cold outside.( now. it's cold outside.
2. We should buy tickets in advance.
3. He must switch off all the lights before he can go home.
4. You must have a passport if you want to enter the country
5. You mustn't smoke in the waiting room.
5. You shouldn't wash your hair now.