1 . I want to be ________ astronaut, because I can fly rockets to ________ moon.

A．a; the

B．an; the

C．a; a

D．an; a

2 . Our teacher told us ________ earth moves around the sun.

A．an

B．the

C．/

3 . Yang Li wants to be ________ astronaut, and she hopes to fly to ________ moon one day.

A．a; an

B．the; an

C．an; the

D．an; an

4 . — Do you often use ________ Internet for shopping?
— Yes, I bought ________ umbrella online just now.

A．/; an

B．/; a

C．the; an

D．the; a

5 . We can’t see ________ sun at ________ night.

A．a; /

B．the; /

C．a; the

D．the; the

6 . —It’s ________ exciting day, isn’t it?
—Yes, it is. Well, ________ sun is going down. We have to go home.

A．a; a

B．a; the

C．an: the

D．an; a

7 . Everyone should play ________ part in saving ________ earth.

A．a; an

B．a; the

C．the; /

D．the; an

8 . More and more people realize saving ________ earth begins with small things.

A．a

B．an

C．the

D．/

9 . —Everyone in the world should play ________ role in saving ________ earth.   
—I agree with you. It is our home.

A．a; the

B．a; an

C．the; a

10 . —Do you want to be __________ astronaut when you grow up?
—Of course. I also hope to take a spaceship to__________ moon in the future.

A．a; a

B．an; the

C．a; the

D．an; a