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

A．an

B．the

C．\

2 . She is reading ________ article about how to save ________ earth.

A．a; the

B．an; a

C．an; the

D．a; an

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

A．a; the

B．an; the

C．a; a

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

A．a

B．an

C．the

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

A．a; the

B．an; the

C．a; a

D．an; a

6 . The Shenzhou-14 manned spaceship returned to ________ earth safely from space in December.

A．a

B．an

C．the

D．/

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

A．an

B．the

C．/

8 . —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

9 . Mom, ________ moon is nice tonight. Let’s stay outside and enjoy it.

A．a

B．an

C．the

D．/

10 . —Earth is ________ only home to everyone.
—Let’s try to make it ________ greener world to live in.

A．a; a

B．a; the

C．the; a