Iv. complete each sentence with a suitable word or phrase: 6. it is absolutely you contact our head office in advance. 7. i think it's high time we locking all the windows at night. 8. would you rather i the lunch, if you feel tired? 9. i wish my car as fast as yours. 10. i'd prefer you smoke in here, if you don't mind.

6. It is absolutely necessary that you contact our head office in advance.
7. I think it's high time we starteed locking all the windows at night.
8. Would you rather I skip the lunch, if you feel tired?
9. I wish my car were as fast as yours.
10. I'd prefer you didn't smoke in here, if you don't mind.