write the question tags. 1. (пример) people have used invisible ink for thousands of years, HAVEN"T THEY? 2. it's completely invisible, … .…

write the question tags. 1. (пример) people have used invisible ink for thousands of years, HAVEN"T THEY? 2. it's completely invisible, … . 3. notmany people know about invisible ink, … 4. you can use milk as invisible ink too, … 5. it goes brown when you heat it, … 6. the paper won't burn when you heat it, … 7. you'll be careful, … помогите пожалуйста.