10. Recently some studies have found that learning _________ second language can　 lead to ___________ increase in one’s brain power.

A. a ; the　　　　　　　　　　　 B．/ ; the　　　　　　　 C. a ; an　　　　　　　　　　　 D. the ; an

9. I can’ t remember when exactly the Robinsons left　　　　 city. I only remember it was　　　　 Monday.

A. the; the　　　　 B. a; the　　　　 C. a; a　　　　 D. the; a

8. My neighbour asked me to go for _______ walk, but I don’t think I’ve got ______energy.

A. a; 不填 　　　　　 B. the; the　　　　　　　 C. 不填; the　　　　　 D. a; the

7. There is a saying, yesterday is history, tomorrow is a mystery ．But today is _____gift． That is why it's called ______ present ．

A．\ ; \　　　　 　 　B． the; a　　　 　　　 C． \;　 a　　　　　 D． a; the

6. -Hey, Tom, you are wanted on　　　 telephone.

-Who is calling?

-　　　 Mr. Green. I don’t know who he is.

A. /; A　　　　　　　　　 　 B. the; /　　　　　　　　　　 C. the; A　　　　　　　　　　　 D. /; /

5. In recent years　　 　global warming is becoming　　 　concern for people all over the world.

A．the; the 　　　　　　　　 B．不填; a　　　　　　 C．不填; 不填　　　　 D．the; 不填

4. All of _____ sudden, the passengers on _____ board let out screams, running upstairs like crazy.

A. a; /　　　　　　　 B. the; the　　　　 C. the; /　　　　 D. a; the　

3. Although he is young, David has gained ____ rich experience in ____ society.

A. the; the　　 　　　　　　 B. a;/　　　　　 C./; /　　　　　 D. /; the

2. He got run over by _____ taxi and now he is still in _____ danger in hospital.

A. /; a　　　　　　　　　　　　 B. a; the　　　　　　　　 C. a; /　　　　　　　　　 　 D. /; /

1. Some of the exercises appear to be　　　 ones that you have done, but after taking　　 second look, you will find that they are different．

A．不填; the　 　 B．the; the　　　　 C．the; a　　　　 D．the; 不填