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.  A subject of great interest (is, are) rainforests.

6.  Hansel and Gretel (is, are) a famous children's story.

7.  The team members (is, are) arguing over the defense tactics.

8.  The economics of the trip (was, were) pleasing.

9.  Why (is, are) your parents going to Africa for a vacation?

10.  The mayor and the governor (hopes, hope) that the bill will soon become a law.