A. left; knowing not
B. left; not knowing
C. leaving; not knew
D. to leave; not knowing

A. rose      
B. raised     
C. risen    
D. rising

A. consisted of      
B. made up        
C. consisting of    
D. making up

A. to provide        
B. providing    
C. provided      
D. provide

1. When I came to the riverside, I found a boy __________(挣扎) in the water.    
2. At ________(高度) of four miles, the air becomes too thin to breathe.
3. She hopes to be a __________(音乐家) in the future.
4. The _______(战士)  was praised for rescuing the child from drowning.
5. People should wash ______(定期)to ensure personal health.
6. Miss Green lives on the _______(十二)floor. We'd better take the lift.
7. The_______(秘书) informed me of his arrival by telephone.
8. Is it convenient for you to spare some time? I'll go and see you next ________(星期四).  
9. The thief ________(承认) his crime when he was questioned by the police.
10. The voice on the phone sounds _________(熟悉) to me.

1. I'm new in the job but I'm already____  experience.
2. Please _____  me a glass of water.
3. His perseverance  _____ him many    friends and a gold medal.
4. He ____ up to $ 50,000 a year by   writing stories.
5. He has ____rich experience theseyears.
6. I have _____   a lot of weight this winter.

1. Mary went along the path _____   wild  flowers.
2. He has been  _____  stamps for 10 years.
3. The peasants are busy____ crops in   the fields.
4. They will  _____  at 8:00 at the park  gate.

A. Looking                          
B. Look
C. To look                        
D. Looked

A. keep    
B. kept    
C. keeping    
D. to keep

A. having led    
B. led    
C. leading    
D. to lead