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Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Why not look up the new word in a dictionary _______ you don’t know it?
A.though        
B.that                            
C.if                             
D.whether
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Exercise 4. 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 16 to 20.
If women choose to pursue a career once they have children, they often miss out on a close relationship with children. Helen Jamieson is a mother of three who has given up work to look after her children (16)_____. She strongly believes that women are pressurized to do too much, (17)_____ themselves to the absolute limit. In her own case, after six years of paid employment, Helen finally decided to call it a day. She says she initially found it hard to be at home, though she never misses the job itself. She admits that if she had had a brilliant career to begin (18) _____, she might feel differently now. Financially, she is no worse off (19)_____ before, as the cost of childcare and commuting exceeded her actual income. (20) _____ the government starts to give other tax incentives to working parents, she says she will not return to the workplace until her children are grown up.
(17)
A.and driving 
B.and taking       
C.driving                    
D.taking

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42.
Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds - any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede farming. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They compete for sunlight, nutrients, and water with useful plants.
The global need for weed control had been answered mainly by the chemical industry. Its herbicides are effective and sometimes necessary, but some pose serious problems, particularly if misused. Toxic compounds threaten animal and public health when they accumulate in food plants, groundwater, and drinking water. They also harm workers who apply them.
In recent years, the chemical industry has introduced several herbicides that are more ecologically sound. Yet new chemicals alone cannot solve the world's weed problems. Hence, scientists are exploring the innate weed-killing powers of living organisms, primarily insects and microorganisms.
The biological agents now in use are environmentally benign and are harmless to humans. They can be chosen for their ability to attack selected targets and leave crops and other plants untouched. In contrast, some of the most effective chemicals kill virtually all the plants they come in contact with, sparing only those that are naturally resistant or have been genetically modified for resistance. Furthermore, a number of biological agents can be administered only once, after which no added applications are needed. Chemicals typically must be used several times per growing season.
Which of the following is NOT given as an advantage of using biological agents over chemical herbicides?
A.They are safer for workers.                                
B.They are less likely to destroy desirable plants.
C.They are more easily available.                         
D.They do not have to be used as often.

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