1. It is amazing that oysters (create/creates) beautiful pearls.
2. They (join, joins) the choir for the holiday pageant.
3. In the spring, trees (sprout, sprouts) leaves quickly when it rains.
4. Entering the West German Parliament in 1983, the Green Party (has, have) worked to protect the environment.
5. Some canned foods (contain, contains) no salt.
6. Every morning my little brother (ask, asks) for oatmeal.
7. In India, they (serve, serves) chicken biriyani on special occasions.
8. I (like, likes) fish for lunch.
9. You (is, are) what you eat.
10. Alicia's missing hamster (run, runs) out of the closet.
11. Eric (make, makes) a delicious salad with spinach and apples.
12. Tomorrow's championship game (has, have) been rescheduled.
13. Each volunteer (promise, promises) six hours of service.
14. Concerned parents (is, are) encouraging their children to wear sunscreen.
15. The candles (glow, glows) brightly in the darkened room.
When identifying verbs that agree in number with their subjects, see whether the verb sounds right in the sentence.
I hope this helped.