According to the passage, 42 is             .
A.an innovation in technology   
B.a tool of virtual communication
C.a type of accommodation  
D.a kind of school

_____(45)
A.ineffective      
 
B.illogical                         
C.irrational                       
D.inefficient

On (A) Sundays I just stay at home (B) because (C) I am usually very tiring (D).
A.On
B.at home 
C.because
D.very tiring

The main purpose of this passage is _______.
A.to explore the botany of ocean floor     
B.to present a short biography of Sylvia Earle
C.to provide an introduction to oceanography
D.to show the historical importance of the Jim dive

_________ unknown quantities is the task of algebra.
A.To found  
B. Find  
C.The find
D.Finding

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 primary stress in each of the following questions.
 

A.suppose                  
B.signal                      
C.student                    
D.problem

Some of the people can’t find a seat in the concert hall.
A.There weren’t enough seats for all the people in the concert hall.
B.There were enough seats for some people in the concert hall.
C.There are some people without a seat in the concert hall.
D. There weren’t enough seats even for some people in the concert hall.

A.control
B.remote
C.purpose
D.respond

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

A.sharp
B.hammer  
C.apple
D.applicant

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
“We gave them the money yesterday, but we haven't received a receipt yet, ______?’’ she asked her husband.
A.didn't we
B.have we
C.did we
D.haven’t we