Read the passage and choose the best option to complete each blank.
            Any change in one part of an ecosystem can cause changes in other parts. Droughts, storms and fires can change ecosystems. Some changes ____46___ ecosystems. If there is too little rainfall, plants will not have enough water to live. If a kind of plant dies off, the animals____47___feed on it may also die or move away.  Some changes are good for ecosystems. Some pine forests need fires for the pine trees to reproduce. The seeds are sealed inside pinecones. Heat from a forest fire melts the seal and lets the seeds ____48___. Polluting the air, soil, and water can harm ecosystems. Building dams on rivers for electric power and irrigation can harm ecosystems ____49___ the rivers. Bulldozing wetlands and cutting down forests destroy ecosystems. Ecologists are working with companies and governments to find better ways of ___50____ fish, cutting down trees, and building dams. They are looking for ways to get food, lumber, and other products for people without causing harm to ecosystems.
___49___
A.on               
B.around  
C.over       
D.under

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
In some families, younger people seem more _______  to save money than their parents.
A.supposed
B.objected
C.suspected
D.inclined

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
We’re still hesitating about which school our son ought to go to.
A. We had great difficulty deciding upon which school our son should attend.
B.We haven’t yet decided where we should send our son to school.
C. We are not sure whether we should let our son choose a school for himself.
D.We won’t send our son to any school unless we are certain that it is the one we want.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
______, others use them in medicine.
A.While some scientists use lasers for military purposes 
B.Used for military purposes by some scientists
C.Lasers are used for military purposes by some scientists
D.Some scientists’ using lasers for military purposes

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
John's ______ and efficiency at the company led to his promotion to Sales Manager.
A.punctuality  
B.punctual 
C.punctuate   
D.punctually

A.while 
B. why 
C.whose  
D.where

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35.
Taking piano lessons and solving math puzzles on a computer significantly improve specific math skills of elementary schoolchildren, according to a new study. The results, (31) ______ were published in the journal Neurological Research, are the latest in a series that links musical training to the development of higher brain functions.
Researchers worked with 135 second-grade students at a school in Los Angeles after (32)______ a pilot study with 102 students. Children that were given four months of piano training as well as time playing (33)______ newly designed computer software scored 27 percent higher on math and fraction  tests than other children.
Piano instruction is thought to enhance the brain's "hard wiring" for spatial-temporal reasoning, or the ability to visualise and transform objects in space and time, says Professor Gordon Shaw, who led the study. At the same time, the computer game allows children to solve geometric and math puzzles that boost their ability to (34) ______ shapes in their mind.
The findings are significant (35)______ a grasp of proportional math and fractions is a prerequisite to math at higher levels, and children who do not master these areas of math cannot understand more advanced math that is critical to high-tech fields.
(Adapted from "Eye on Editing 2" by Joyce S. Cain)

(33)
A.for                            
B.of                         
C.at                       
D.with

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Could you _                                           me a hand with the washing-up, Kent?  
A.join
B.shake
C.hold
D.give

Mark the letter A, B, C or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

A.talked         
B.missed                    
C.learned                   
D.watched

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
He smokes too much; perhaps that's why he can't get rid of his cough.
A.If he didn't smoke so much, he may get rid of his cough.
B.If he smoked less, he might be able to get rid of his cough.
C.If he smoked so much, he couldn't get rid of his cough.
D.If he does not smoke, he may not have his cough.