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

A．a

B．an

C．the

D．/

2 . —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

3 . More and more people have realized saving ________ earth begins with small daily things.

A．a

B．an

C．the

D．/

4 . As ________ earth moves around ________ sun, we can have different seasons.

A．the; the

B．an; the

C．an; a

D．a; a