A. five hundred    
B. five thousand  
C. five million    
D. five billion

A. hundred                  
B. hundreds of
C. hundred of                
D. hundreds

A. three thousands            
B. three thousand
C. thousands of              
D. three thousands of

A. twice a day  
B. two  
C. once  
D. often

1. The students took the PISA test in _____subjects - reading, maths and science. (third)
2. Board games are more and more popular among _____. (teenager)
3. I liked to walk in fields on _____days and to see my footprints left behind. (snow)
4. _____people often begin their conversations by talking about the weather. (Britain)
5. The news about education has attracted the public attention _____. (recent)
6. The World Chocolate Park showed a_____of many kinds of chocolates. (collect)
7. To improve your writing skills, you'd better _____a habit of reading. (development)
8. Don't tell lies. Nobody likes those _____people. (honest)

A. thousand      
B. thousands  
C. thousand of    
D. thousands of

A. That ; thousands of
B. It; five thousand of
C. It; thousands of
D. This; three thousand

A. two year and a half
B. two and a half year
C. two years and half a
D. two and a half years

A. Million                      
B. Millions    
C. Millions of                    
D. Million of

A. million of
B. millions of
C. two millions of