23. It can be inferred from the passage that kerosene was preferable to whale oil because whale oil was too _____.
(A) hard to get
(B) hot
(C) thick
(D) polluted

19. Ranchers worry that their sheep will _____. (A) be attacked (B) go hungry (C) run away (D) grow to big

20. What happened after a law was passed to protect wild horses? (A) The horses went east (B) No horses were left (C) All the horses were adopted (D) There were too many horses

21. How many horses can be put up for adoption with $1,500? (A) 5 (B) 50 (C) 300 (D) 500

22. What is the best title for the passage? (A) The California Gold Rush: Get Rich Quickly (B) Oil Refining: a Historical Perspective (C) Kerosene Lamps: a Light in the Tunnel (D) Private Property: Trespassers Will Be Prosecuted

24. According to the passage, many people initially thought that E. L. Drake had made a mistake by _____. (A) going on a whaling expedition (B) moving to Pennsylvania (C) searching for oil (D) retiring from his job

25. According to the passage, what is “black gold”? (A) Whale oil (B) Stolen money (C) Gold ore (D) Crude oil

26. Why does the author mention the California gold rush? (A) To explain the need for an increased supply of gold (B) To argue that gold was more valuable than oil (C) To indicate the extent of United States mineral wealth (D) To describe the mood when oil was first discovered

27. The main idea of the passage is to _____. (A) detail how the Dream Pill works on a chemical level in the brain. (B) explain some sleep disorders and how the Dream Pill might offer some relief. (C) discuss the background of certain scientists as they research on sleep disorders. (D) communicate how important it is to get a good night's sleep when working.

28. According to the second paragraph, the side effects of drugs for insomnia _____. (A) will always be a problem as long as insomnia is a problem in our society. (B) include drowsiness during the day and risk of dependence, even addiction. (C) may cause one to fall asleep at any moment of the day. (D) only affect those who have high levels of stress or don't eat a healthy diet.

29. Since one of the benefits of the Dream Pill is low risk of dependence, _____. (A) there is no way for the medicine to offer much relief for those suffering from insomnia or narcolepsy. (B) it is not suitable for people who wish to stop drinking alcohol or taking illegal drugs. (C) this may offer relief to people with insomnia, since they might worry about becoming addicted to traditional sleeping pills. (D) people with sleeping disorders are likely to become addicted to this pill, causing some fear among scientists.