Choose the best answer to complete the following question.
Most people can ______ clearly between a real and stimulated smile.
A.difference
B.differ
C.different
D.differentiate

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
The ______ horse began to run as fast as he could.
A.frightening
B.frightful
C.frightened
D.frighten

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
It can be an amazing experience for those who have the ______ to leave their family and friend and live in a new place.
A.encouragement
B.courage
C.encourage
D.courageous

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
All the teachers work on an entirely ______ basis.
A.voluntary
B.volunteered
C.volunteer
D.voluntarily

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Most office furniture is bought more on the basis of _______ than comfort.
A.affording
B.affordability
C.afford
D.afforded

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Population explosion seems to surpass the ability of the earth to meet _____ food.
A.the demanding for
B.the demand at
C.the demanding at
D.the demand for

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
In 1973, when the tigers appeared to be facing _______ the World Wide Fund for ________ and the Indian Government agreed to set up "Operation Tiger".
A.extinct/ Naturalists
B.extinction/ Natural
C.extinction/ Nature
D.extinct/ Nature

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
There is too much____ in this world.
A.greedness
B.greediness
C.greed
D.greedy

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
They are close-knit family and very _______ of one another.
A.support
B.supporting
C.supportive
D.supported

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
The top tourist ________in Vietnam, Ha Long bay features thousands of islands, each topped with thick jungle vegetation, forming a spectacular seascape of limestone pillars.
A.attract
B.attraction
C.attractive
D.attractiveness