The word “they” in the second paragraph refers to _________.
A.formulas      
B.objects     
C.numbers
D.database

When the earthquake occurred, all the staffs (work) _____________ in the office.
A.
B.
C.
D.

The building _______ I am living was built in 1910s.
A.which
B.that
C.where
D.of which

The quality of these recordings ________not very good.
 
A.is                              
B.are                                  
C.has                              
D.have

Although there were a lot of opposition initially, many people now accept that infertile couples have the right to medical help.
A.were
B.initially
C.now
D.to medical help

Nobody helped me to make this cake.
A.It's all my work own
B.It's all my own work.
C.It's all the own work.
D.It's my- whole own work.

I was glad when he said that his car was__________.
A.for me use  
B.at my use        
C.for my use       
D.at my disposal

Which of the following statement would the author LEAST agree with?
A.Most people follow the same pattern of mathematical development.
B.Children learn to add before they learn to subtract.
C.Children naturally and easily learn mathematics.
D.Mathematical development is subtle and gradual.

In line 2, the author uses the expression have opened a window to indicate that the use of optical fibers
 
A.has enabled scientists to make amazing discoveries
B.sometimes requires a surgical incision
C.allows doctors to see inside the body without major surgery
D. has been unknown to the general public until quite recently

Mark the letter A, B, C or D to indicate the best answer to complete each of the following sentences.
It is recommended that she                                       a short speech before the ceremony.
A.should have been preparing
B.prepares
C.prepare                                                                   
D.is prepared