Add tag questions to the following

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EXERCISE 1: Add tag questions to the following
1. I'd better go now,
2. Your
bothers
always
learn
hard,
3. The number of rare animals is decreasing rapidly,
4. Visitors do not help to preserve and protect
national parks,
5. Noone has been there,
6. The Smiths have two cars,
7. It could be done,
8. She's got lovely blue eyes,
9. She'd save money if she bought fresh food,