19.
(A) encouraging an alternative of
(B) leading to a ban on
(C) and bringing about an impediment to
(D) hindered the reform of

15. (A) Had it not been for the establishment of a causal link (B) Should a causal link be established (C) Were it not for the establishment of a causal link (D) If a causal link should have been established

16. (A) likewise (B) otherwise (C) unlikely (D) whatsoever

17. (A) when (B) that (C) , which (D) those

18. (A) economic downturn (B) blessing in disguise (C) trump card (D) identity crisis

20. (A) called for (B) acclaimed (C) suggesting (D) have conspired

21.(A) Little did he know that those tragedies would lay the foundation for one of the business’s great comeback stories. (B) Tragedy continued to strike, however. (C) But his love of toys pushed the company ahead, even when it limped. (D) But if it weren’t for a series of fires—and an ingenious woodworker—LEGOS may never have been built. (E) At first, Christiansen’s shop produced furniture like ladders, stools, and ironing boards.

22.(A) Little did he know that those tragedies would lay the foundation for one of the business’s great comeback stories. (B) Tragedy continued to strike, however. (C) But his love of toys pushed the company ahead, even when it limped. (D) But if it weren’t for a series of fires—and an ingenious woodworker—LEGOS may never have been built. (E) At first, Christiansen’s shop produced furniture like ladders, stools, and ironing boards.

23.(A) Little did he know that those tragedies would lay the foundation for one of the business’s great comeback stories. (B) Tragedy continued to strike, however. (C) But his love of toys pushed the company ahead, even when it limped. (D) But if it weren’t for a series of fires—and an ingenious woodworker—LEGOS may never have been built. (E) At first, Christiansen’s shop produced furniture like ladders, stools, and ironing boards.

24.(A) Little did he know that those tragedies would lay the foundation for one of the business’s great comeback stories. (B) Tragedy continued to strike, however. (C) But his love of toys pushed the company ahead, even when it limped. (D) But if it weren’t for a series of fires—and an ingenious woodworker—LEGOS may never have been built. (E) At first, Christiansen’s shop produced furniture like ladders, stools, and ironing boards.

25.(A) Little did he know that those tragedies would lay the foundation for one of the business’s great comeback stories. (B) Tragedy continued to strike, however. (C) But his love of toys pushed the company ahead, even when it limped. (D) But if it weren’t for a series of fires—and an ingenious woodworker—LEGOS may never have been built. (E) At first, Christiansen’s shop produced furniture like ladders, stools, and ironing boards.