1 . The Internet is changing the world. It is becoming________ important part of our lives.

A．a

B．an

C．the

D．/

2 . —Sam, do you know ________ woman in red?
—Yes, she is ________ expert from Beijing University.

A．a; an

B．an; a

C．the; a

D．the; an

3 . —Lisa, do you know ________ woman we met just now?
—Yeah, she is ________ astronaut from Australia.

A．a; the

B．the; an

C．the; a

D．a; an

4 . —Why are you so excited, Mike?
—Because I got ________ invitation from Mary. She asked me to go to ________ concert with her.

A．a; a

B．an; the

C．an; /

D．a; the

5 . — Do you want to be ________ astronaut when you grow up, Michael?
— No. I want to be ________ computer programmer.

A．a；a

B．an；a

C．an；the

D．the；a

6 . ─Nancy, do you know ________old lady in blue?
─Yes, she is a teacher of ________ university.

A．a; an

B．the; an

C．the; a

D．the; the

7 . —What did you buy ________ yesterday morning?
—I bought ________ umbrella.

A．on; a

B．不填;a

C．on; an

D．不填; an

8 . 幸运的是，他去年得到了一个在北京的一所大学教英语的机会。
Luckily, he got a chance to teach English ___________________________ in Beijing last year.

9 . 上海是一个比香港更古老的城市。
Shanghai is ________ ________ ________ ________ Hong Kong.

10 . ——Why do you like Jack?
——Because he is _______honest boy.

A．a

B．an

C．the

D．/