19. The capacity for flight _____ insects from the other invertebrates.
(A) distinguish
(B) to distinguish
(C) distinguishing
(D) distinguishes

15. In the eating disorder bulimia nervosa, a person will go on huge eating binges and then try to nullify the outrageous food intake by purposely vomiting or strictly dieting. (A) increase (B) repeat (C) undo (D) delay

16. But accomplishing all this social learning without in-person interactions is difficult, _____ impossible, under quarantine. (A) if (B) if not (C) if only (D) as if

17. Electric scooters have appeared in dozens of cities _____ plenty of fans and as many enemies who view them as a nuisance. (A) are winning (B) won (C) winning (D) have won

18. The Liberty Bell is an object of great reverence because it _____ in 1776 to proclaim the signing of the Declaration of Independence. (A) was rung (B) were rung (C) has rung (D) rung

20. Which of the following is grammatically accurate? (A) Malvin Gray Johnson is noted especially for the pictures who he painted in Brightwood, Virginia, in the late summer of 1934. (B) Successful economists must be able understand the effect of world events on national economies. (C) The distinction between complex and simple lipids lie in their cell structure. (D) The fundamental problem of a tax system is to collect enough money to pay for the expenses of government.

21. (A) off (B) at (C) on (D) upon

22. (A) three (B) thirds (C) third (D) threes

23. (A) investing (B) entrepreneur (C) illuminating (D) entry

24. (A) spell (B) skill (C) drill (D) distill

25. (A) exploits (B) recruits (C) prompts (D) projects