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№ 16
1. an, the
2. a, the
3. - , the
4. - , -
5. a, -
6. a, -
7. a
8. a, the
9. a
10. - , -

№ 19
1. Is there
2.  Are there
3. Is there much
4. Are there many
5. some
6. much
7. some
8. She never wears