Write the question tags. 1.(пример) people have used invisible ink for thousands of years, haven"t they? 2. it's completely invisible, 3. not many 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, .

2. it's completely invisible, isn't it?

3. not many people know about invisible ink, don't they?

4. you can use milk as invisible ink too, can't you?

5. it goes brown when you heat it, doesn't it?

6. the paper won't burn when you heat it, will it?

7. you'll be careful, won't you?

2..., isn't it?

3..., don't they?

4,can't you?

5,doesn't it?

6, will it?

7, won't you?