1 . The Earth is ________only home for mankind. We must protect________planet as we protect our own eyes.

A．an; the

B．an; a

C．the; a

D．the; the

2 . Daming is eating ________ ice cream in ________ sun.

A．an; the

B．an; /

C．a; the

D．a; a

3 . — What do you think of ________ virus COVID-19?
— It is very terrible. I’ve never met   ________ much more serious disease.

A．the;a

B．a;a

C．a;the

D．the; the

4 . —Please look at______ moon in the sky, Betty.
—Wow! It looks like________ round plate（盘子）.

A．a; the

B．the; the

C．a; a

D．the; a

5 . ―Tomorrow is Sunday. How do you spend it?
―I want to go on________ trip to ________Great Wall.

A．a; the

B．/; the

C．the; a

D．the; /

6 . I am going to be _____astronaut when I grow up. And I will fly rockets to ______ moon.

A．an;a

B．a;/

C．an; the

7 . Chinese learning is popular with people all over ______ world．

A．a

B．/

C．the

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

A．a

B．an

C．the

9 . Our earth is ________ very small planet in ________ universe.

A．a,an

B．a, the

C．an. a

D．a, /

10 . CNSA announced that China's Chang'e-4 probe landed on the far   side of moon on January 3^rd, 2019. It is historic moment for the Chinese to explore space.

A．a; an

B．an; a

C．the; a

D．the; an