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Use the correct verb tense or form :

1. Rickets is a children’s disease cause by a lack of vitamin D. 

2. Measles is a dangerous disease for pregnant women. 

3. Statistics is a difficult course for people to understand. 

4. Statistics shows that approximately 40 percent of all marriages in the Unites States end in divorce. 

5. The United States consists of 50 states. 

6. Two hours is too long to wait, don’t you think ? 

7. Cattle are allowed to graze near the church. 

8. The police have arrested the thief recently. 

9. Peaches and cream is delicious. 

10. Peaches and cream is perishable and be refrigerated. 

11. The majority of the birds migrate for winter. 

12. The majority of the homework is useful. 

13. A number of books on U.S universities are in the library.

14. The number of books on U.S universities totals fifteen. 

15. Kara Walters, together with her classmates, resents a formidable opponent on the basketball court. 

16. Either the physicians in the hospital or the chief administrator is going to have to make a decision. 

17. Is my boss or my sisters in the union going to win the game ? 

18. Everyone selected to serve on this jury is to be willing to give up a lot of time. 

19. Three-quarter of the students are against tuition hike.