The carbon dioxide in the atmosphere is believed to produce the greenhouse effect by ______.
A.dissipation into outer space
B.being widely used for agricultural purposes in greenhouse
C.being burned on the ground
D.preventing heat radiation from escaping the earth's atmosphere

(33)
A.determine    
B.determining 
C.determined  
D.determination

(31) 
A.Same            
B.Like                        
C.Alike                      
D.As

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.
Sue is very slow. She can’t understand what you might say.
A.What you might say, Sue can’t understand slowly.
B.Sue is so slow that she can’t understand what you might say.
C.Sue is so slow to understand what you might say.
D.Sue is not enough quick to understand what you might say.

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the followings.
When he was a schoolboy, he had to study by the light of ______ moon.
A.an                                  
B.some                              
C.a
D.the

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the followings.
Fortunately, I arrived at the hall just ______ to attend the conference.
A.at times        
B.by the time 
C.on time 
D.in time

Mark the letter A, B, C, or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges.
John is late for class and enters the classroom while the teacher is explaining the lesson.
John: “I’m sorry, I’m late.” - Teacher: “______.”
A.Come in, please          
B.Needless to say   
C.Me too           
D.You’re very kind to say so

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of the primary stressed syllable in each of the following sentences.

A.scientific                 
B.undergraduate         
C.sociology                
D.secondary

The word deadline in the passage is closest in meaning to____.
A.closing date       
B.unexpired                
C.opening ceremony       
D.closing ceremony

Mark the letter A, B, C, or D on your answer sheet to indicate the answer that best completes each of the following sentences.
German physicist Wilhelm Roentgen _____ X-rays while he _____ a routine experiment involving cathode rays.
A.discovered, was performing       
B.discovered, performed
C.was discovering, performed     
D.was discovering, was performing