__________(50)
A.conversation   
B.subject        
C.research 
D.topic

__________(49)
A.present     
B. absent   
C.concentrated    
D.mentioned

__________(48)
A.run  
B.reach       
C.range          
D.random

__________(47)
A.stories 
B.topics    
C.gossips   
D.conversations

__________(46)
A.researches 
B.things   
C.conversations    
D.gossiping

What does the passage mainly discuss?
A.Why some species of birds nest together         
B.How birds maintain body heat in the winter
C.Why birds need to establish territory    
D.How birds find and store food

The word “conserve ”in line 3 is closest in meaning to
A. watch 
B.retain   
C.share
D.locate

Finish each of the following sentences in such a way that it means the same as the sentence printed before it.


65. I’m sorry that I didn’t finish my homework.  - I wish ____________________________________­­­­­­­­__.


66. Please don’t turn on the radio.


  - I’d rather ____________________________________.


67. Mary doesn’t speak English so well as Jane.


  -  Jane _______________________________________.


68. He last had his eyes tested ten months ago.


- He hasn’t _______________________________________.


69. "You shouldn't have leaked our confidential report to the press, Frank!" said Jane.


- Jane accused ____________________________________.
A.
B.
C.
D.

The word “they” in line 20 refers to _____
A.few birds 
B.mass roosts
C.predators     
D.trees

Which of the following is a disadvantage of communal roosts that is mentioned in the passage?
A. Diseases easily spread among the birds.     
B.Groups are more attractive to predators than individual birds.
C. Some birds in the group will attack the others. 
D.Food supplies are quickly depleted.