Page 106 - Self Study 2 - Web Edition

GRAMMAR

17. The aurora borealis most often ---- from 21. The countries all over the world ---- fossil
September to October and from March to fuels irresponsibly over the past 60 years and
April, so people from all around the world ---- by the end of the 21st century we ---- them
to Northern Europe to see the phenomenon. altogether.
A) occurred / had gone A) have been consuming / have consumed
B) occurs / go B) consumed / will consume
C) has occurred / have gone C) are consuming / will be consuming
D) will occur / went D) have consumed / will have consumed
E) is occurring / are going E) will be consuming / have been consuming

18. Mobile phones ---- more common in the last 22. Over the course of history, many civilizations
decade and they ---- to do so for the next 30 ---- to domesticate leopards, but as the
years. scientists ----, not even one could be tamed.

A) have become / will continue A) have tried / suggest
B) will become / have continued B) tried / are suggesting
C) became / will be continuing C) had tried / suggested
D) had become / would continue D) will try / had suggested
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E) are becoming / will have continued E) have been trying / were suggesting

19. Scientists and engineers ---- to express their 23. New video game consoles like Wii and Play
ideas in the form of equations because they Station IV ---- incredible graphics to the
---- to know the precise value of quantities. consumers and youngsters in developed
A) have tended / needed countries ---- to have one of them at all costs.
A) have been offering / yearned
B) had tended / have needed
C) tend / need B) had offered / have yearned
C) offer / are yearning
D) tend / needed
E) have tended / will have needed D) are offering / will yearn
E) offered / would yearn

20. Turkey ---- two communication satellites in the 24. Even a slight crack on the surface ---- to vital
space and ---- a lot of money thanks to them. consequences as soon as the space shuttle
---- the atmosphere.
A) launched / had earned
B) was launching / was earning A) has been leading / is entering
B) will lead / has entered
C) is launching / would earn
D) has launched / has earned C) will have led / was entering
D) has led / will have entered
E) has been launching / earned
E) leads / will enter

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