1 . It’s ________ pleasure to see ________ sun rising in ________ east.

A．/; the; /

B．a; /; /

C．a; the; the

D．/; the; the

2 . What can we do to protect ________ Earth?

A．a

B．an

C．the

D．/

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

A．a

B．an

C．the

D．/

4 . ________ moon is smaller than ________ earth.

A．A; a

B．The; a

C．The; the

D．A; the

5 . ________ moon is very bright at night.

A．A

B．An

C．The

6 . —Will it rain this afternoon?
—I don’t think so. Look at _________ sun.

A．a

B．an

C．the

D．/

7 . —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

8 . The Grand Canyon is ________ great wonder of ________ natural world.

A．an; the

B．the; a

C．the; 不填

D．a; the

9 . — Look! What’s that moving high up in ________ sky?
— It must be ________ plane.

A．a；the

B．the；/

C．the；a

D．/；a

10 . They are having ________ great time under ________ sun.

A．a; an

B．an; a

C．an; the

D．a; the