17. Martha Graham, a (A)leading figure in modern dance, made she(B) debut in (C)1920 with(D) the Denishawn School.
18. In the United States, the federal government (A) is responsible to(B) regulating the working conditions(C) in factories(D).
19. Jupiter is(A) a gaseous planet with(B) an atmosphere composed most(C) of hydrogen and(D) helium.
20. Throughout her career(A) Georgia O'Keeffe paid(B) meticulous attention to her craft;her brushes were always(C) clean, her colors fresh and brightness(D).
21. Hydrogen the nine (A) most abundant element in the Earth's crust(B), is an(C) odorless, colorless, and tasteless(D) gas.
22. Salamanders are frequently (A) to be find(B) in moist(C), wooded(D) areas.
23. Steam engines have been replaced (A) in most(B) cases by(C) more economical and efficiency(D) devices, such as the electric motor.
24. Traditionally(A), the Fourth of July is celebrated(B) in the United States with political speeches, picnics, and most important of all(C), a displayed(D) of fireworks at night.
25. The style of used (A) in cartoon animation range from relatively(B) realistic representations of everyday life to the most romantic and impossible fantasy(D).
26. Ordinary(A) beaver dams vary(B) in length from a few feet(C) to a hundred feel ormore than(D).
27. In the United State, presidential elections(A) are held(B) once every(C) four year(D).
28.Except of (A) the freehand toe, the feet(B) of the(C) gull are fully(D) webbed.
29. Teaching machines are devices that can store instructionally(A) information,present displays, receive(B) responses from a learner(C), and act on those(D) responses.
30. Challotte Perkins Gilman Is known primarily (A) as an author of short(B) stories, but she also wrote an influential book argued(C) for equal(D) economic opportunities for women.