Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Water volume in rivers in central Vietnam will decline by 30 to 50 percent, potentially leading to a _______ between April and June.
A.scarify
B.scarcity
C.scarcely
D.scarce

Choose the best answer to complete the following question.
Students can gain _______ benefits from learning to work together.
A.considering
B.considerate
C.consideration
D.considerable

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Don’t worry. He’ll do the job as _______ as possible.
A.economic
B.economizing
C.economically
D.uneconomically

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