Answer:
1. Art and music are my favorite subjects.
2. Two hours are a long time to have to wait.
3. Both my mother and my father are doctors.
4. Either blue or green are the right color for the
room.
5. Tayabas, my birthplace, is wonderful city.
6. The trees next to the school is going to be cut down.
7. Walking up hills are quite tiring.
8. The house, together with a piece of land, are now on the market.
9. Fax and e-mail are modern forms of communication.
10. Florante at Laura is a play by Francisco Balagtas.
To decide what to use if is or are you should know that you will use is if it is singular and are if it is plural or more than 2.