1. Mumps (is, are ) not common among adults.
2. Viruses from third world countries (is, are ) a major concern.
3. Most of the sand (is, are ) wet from the high tide.
4. Either the two kittens or the puppy (sits, sit ) in my lap while I watch television.
5. The team members (is, are ) arguing over the defense tactics.
6. The economics of the trip (was, were ) pleasing.
7. Why (is, are ) your parents going to Africa for a vacation?
