1. ___________ they are tropical birds, parrots can live in temperate or even cold climates.
A. Despite
B. Even though
C. Nevertheless
D. But
2. Natural silk is still highly prized _______ similar artificial fabrics.
A. although is available
B. despite there are available
C. in spite of the availability of
D. even though an availability of
3. The president of the United States appoints the cabinet members, ______ appointments are subject to Senate approval.
A. their
B. with their
C. because their
D. but their
4. The prisoners were prevented from speaking to reporters because ______.
A. not wanting the story in the papers
B. the story in the papers the superintenddn did not want
C. the public to hear the story
D. the superintendent did not want the story in the papers
5. __________ towards shore, its shape is changed by its collision with the shallow sea bottom.
A. During a wave rolls
B. As a wave rolls
C. A wave rolls
D. A wave's rolling
6. ____________ are increasingly linked over long distances by electronic communications, but many of them still prefer face-to-face encounters.
A. Although people
B. Despite people
C. Today people
D. The fact that people
7. Cattle ranches are found almost ______ in Utah.
A. wherever
B. everywhere
C. overall
D. somewhere
8. If ultraviolet radiation enters the Earth's atmosphere, _____ generally blocked by the ozone concentrated in the atmosphere.
A. it
B. it is
C. so it is
D. then it
9. ________ show the relations among neurons, they do not preclude the possibility that other aspects are important.
A. Neural theories
B. A neural theory
C. Although neural theories
D. However neural theories
10. _________ together in one place, they form a community.
A. When people live
B. When people living
C. Whenever people who live
D. Whenever living people
11. _________ managed by an independent governor and board of directors, the Bank of Canada is owned by the Canadian government.
A. And yet
B. In spite of it
C. Although
D. It is
12. _______ pieces of rope are of different thickness, the weaver's knot can be used to join them.
A. Two of
B. What two
C. Two such
D. If two
13. _________ the seeds of the Kentucky coffee plant are poisonous.
A. Until they have been cooked
B. Cooking them
C. They have been cooked
D. Cooked until
14. __________ through a prism, a beam of white light breaks into all the colors of the rainbow.
A. When shines
B. It shines
C. It is shone
D. When shone
15. ________ most people think of freezing as a relatively modern method of food preservation, it is actually one of the oldest.
A. Even
B. As though
C. However
D. Even though
16. ________ large bodies of water never freeze solid is that the sheet of ice on the surface protects the water below it from the cold air.
A. Because
B. Why do
C. The reason that
D. For the reason
17. _________ granted by the Patent Office, it becomes the inventor's property and he or she can keep it, sell it, or license it to someone else.
A. Once a patent is
B. When a patent
C. A patent, once
D. A patent, whenever it
18. Owls can hunt in total darkness ______ their remarkably keen sense of smell.
A. since
B. because of
C. the result
D. that
19. _________ most bamboo blooms every year, there are some species that flower only two or three times a century.
A. Whenever
B. That
C. While
D. However
20. ________ advertising is so widespread in the United States, it has had an enormous effect on American life.
A. Why
B. The reason
C. On account of
D. Since
