15. The book fair ①outdoors was ②to be opened yesterday, but they were obliged ③to postponing it ④on account of the sudden blizzard.
16. ①To the most fully extent possible, these model format and schemes ②should comply with the ③existing standards ④developed by the federal government.
17. ①Have you met her ②as she was standing with head ③tilted, you ④would have seen an unforgettable smile on her face.
18. In fact, ①on no other foreign policy issue ②does average Americans disagree more ③with government and business leaders ④than on immigration.
19. Consolidation among the mainline carriers ①means fares ②have increased while the number of available ③seats ④haven’t.
20. ①Thinking over the losses which England ②has forced her by steam and the ③ingenuity of the engineer, one ④is disposed to count the decay of the windmill among others.