2 . ______ earth is only a small planet in ______ Galaxy.

A．The; a

B．The; the

C．An; a

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

A．an

B．the

C．\

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

A．a; the

B．an; the

C．a; a

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 . 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

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

A．/; an

B．/; a

C．the; an

D．the; a

10 . ______ Yangtze River is ______ longest river in China.

A．The; the

B．/; the

C．/; a

D．The; a