83. I have kept that portrait ________ I can see it every day, as it always reminds me of my university days in London.
A) which B) where C) whether D) when

84. Doing your homework is a sure way to improve your test scores, and this is especially true ________ it comes to classroom tests.
A) when B) since C) before D) after

85. Liquids are like solids ________ they have a definite volume.
A) in that B) for that C) with that D) at that

86. In some countries, ________ is called “equality” does not really mean equal rights for all people.
A) which B) what C) that D) one

87. Scientists say it may be five or ten years ________ it is possible to test this medicine on human patients.
A) since B) before C) after D) when

88. You will want two trees about ten feet apart ________ you can suspend your tent from two trees.
A) there B) them C) which D) where

89. They are teachers and don’t realize ________ to start and run a company.
A) what it takes B) what takes it C) what they take D) what takes them

90. Not that John doesn’t want to help you, ________ it’s beyond his power.
A) but that B) for that C) and that D) in that

91. There is hardly an environment on earth ________ some species of animal or other has not adapted successfully.
A) as to B) wherever C) so that D) to which

92. The time has come ________ we can make extensive use of nuclear energy.
A) when B) while C) as D) since

93. The situation today is obviously quite different from ________ it was only 50 years ago.
A) such B) which C) when D) what

94. ______ you decide to take up, you should try to make it a success.
A) If only B) Unless C) Whatever D) Whenever

95. It was not until he arrived at the station ________ he realized he had forgotten his ticket.
A) that B) before C) when D) after

96. Language is a city ________ every human being brought a stone to the building of the city.
A) which B) that C) it D) this

97. Government cannot operate effectively ________ i