Jack was very tired _______ he played tennis all afternoon .
| 
   A.if  | 
  
   B.as soon as  | 
  
   C.because  | 
  
   D.before  | 
 
_______ he was sleeping , they stole his clothes.
| 
   A.While  | 
  
   B.When  | 
  
   C.As  | 
  
   D.Which  | 
 
He was walking along the sands _______ he saw a big foot-print in the sand .
A. while B. when D. as D. after
You’d better come back earlier _______ it is getting colder.
| 
   A.as  | 
  
   B.and  | 
  
   C.but  | 
  
   D.or  | 
 
He always talks _______ he had been to outer space.
| 
   A.like  | 
  
   B.as if /though  | 
  
   C.because of  | 
  
   D.as  | 
 
Persist to the end , _______ you are the only one left.
| 
   A.even if /though  | 
  
   B.but  | 
  
   C.however  | 
  
   D.in spite of  | 
 
