_________(43)
A.a ratio 
B.a measure 
C.an average 
D.a proportion

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
The new computer system ______ for the post office will allow accounts to be managed over the Internet.
A.design                     
B.designing                
C.designed                 
D.which designing

___________(72)
A.learning
B.to learn
C.with learning
D.learn

The doctor _________me not to stay up too late at night.
A.advised
B.suggested       
C.insisted    
D.forced

We should do some thing to protect water from being polluted____ we will have nothing to drink in the future.
A.if
B.whether
C.or
D.unless

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
“I think I can find the information on my own.” – “______ any help, just call me.”
A.Should you need        
B.Had you needed
C.Were you to need    
D.In case of you need

Choose the best answer to each of the following questions.
Bill Gates has made large donations to numerous ____ organizations.
A.charitable                
B.charitably                
C.charity                    
D.charities

............he had not paid his bill, his electricity was cut off.
A.Because
B.As
C.Since
D.All are correct

Exercise 2. Mark the letter A, B, C or D to indicate the correct answer to each of the following questions.
Every week, his mother goes to ____ university to visit him while my mother has never come to visit me since I went to ____ university.
A.the - Ø      
B.the - the     
C.Ø - Ø      
D.a - the

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 that follow.
 
Under certain circumstances, the human body must cope with gases at greater-than-normal atmospheric pressure. For example, gas pressures increase rapidly during a drive made with scuba gear because the breathing equipment allows divers to stay underwater longer and dive deeper. The pressure exerted on the human body increases by 1 atmosphere for every 10 meters of depth in seawater, so that at 39 meters in seawater a diver is exposed to pressure of about 4 atmospheres. The pressure of the gases being breathed must equal the external pressure applied to the body, otherwise breathing is very difficult. Therefore all of the gases in the air breathed by a scuba diver at 40 meter are present at five times their usual pressure. Nitrogen, which composes 80 percent of the air we breathe, usually causes a balmy feeling of well-being at this pressure. At a depth of 5 atmospheres, nitrogen causes symptoms resembling alcohol intoxication, known as nitrogen narcosis. Nitrogen narcosis apparently results from a direct effect on the brain of the large amounts of nitrogen dissolved in the blood. Deep dives are less dangerous if helium is substituted for nitrogen, because under these pressures helium does not exert a similar narcotic effect.
As a scuba diver descends, the pressure of nitrogen on the lungs increases. Nitrogen then diffuses from the lungs to the blood, and from the blood to body tissues. Nitrogen then diffuses from the lungs to the blood, and from the blood to body tissues The reverse occurs when the diver surfaces, the nitrogen pressure in the lungs falls and the nitrogen diffuses from the tissues into the blood, and from the blood into the lungs. If the return to the surface is too rapid, nitrogen in the tissues and blood cannot diffuse out rapidly enough and nitrogen bubbles are formed. They can cause severe pains, particularly around the joints.
Another complication may result if the breath is held during ascent. During ascent from a depth of 10 meters, the volume of air in the lungs will double because the air pressure at the surface is only half of what it was at 10 meters. This change in volume may cause the lungs to distend and even rupture. This condition is called air embolism.
To avoid this event, a diver must ascend slowly, never at a rate exceeding the rise of the exhaled air bubbles, and must exhale during ascent.
The word “they” in bold in paragraph 2 refers to ________.

A.tissues             
B.joints    
C.bubbles       
D.pains