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.