1. (Do, Does) rings really tell the age of a tree?
2. Americans (has, have) played basketball for about seventy years.
3. Treasure Island (tell, tells) about a boy's adventures with pirates.
4. All the girls in our class (has, have) promised to bake cakes for the fair.
5. Ted's hobbies (include, includes) raising tropical fish and building gasoline-powered model airplanes.
6. (Do, Does) leaves manufacture chlorophyll?
7. The Dutch people (are, is) renowned for their persistence in reclaiming land from the sea.
8. Sandy (go, goes) to some of the football games but (doesn't, don't) understand the rules very well.