_____that life began billions of years ago in the water.
A. In the belief          
B.It is believed    
C.The belief   
D.Believed

Childrearing is the women’s most wonderful role.
A.Giving birth to a baby
B.Having no child  
C.Bringing up a child
D.Educating a child

She _____her homework before eight o’clock last night.
A.finished     
B. has finished   
C. had finished  
D.was finished

Most species of heliotropes are weeds, ______ of them are cultivated.  
A.some      
B.but some      
C.for some species    
D.some spices

They’re  staying  with  us______ the time  being  until  they  can afford  a  house.
A.during      
B.at    
C.for
D.in

Pearl Sydenstricker Buck, ______ the Nobel Prize for Literature in 1938, is best-known for her novels about China.
A.who won      
B.winner of        
C.to win             
D.who the winner of

Nam’s been studying really hard, ______ he can pass the exams.
A.but          
B.therefore     
C.however            
D.so

Keep quiet! You ______ talk so loudly in here. Everybody is working.
A.mustn’t       
B.must       
C.needn’t  
D.need

If you want to lose weight, you’ll have to _____ less.  
A.get used to eat  
B.be used to eat 
C. get used to eating   
D.used to eat

______ is present in the body in greater amounts than any other mineral.
A.There is calcium 
B.Calcium
C. Calcium, which       
D.It is calcium