1 . As we know, ________ earth is our home. So we must try our best to make it better.

A．an

B．the

C．\

2 . On Mid-Autumn night Chinese people admire ________ moon and eat mooncakes.

A．a

B．an

C．the

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

A．an

B．the

C．/

4 . 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

5 . When I was in Sanya, I enjoyed ________ moon at night.

A．/

B．a

C．the

6 . China has set a goal of sending astronauts to ________ moon.

A．a

B．an

C．the

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