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

A．a

B．an

C．the

2 . —Are you reading ________ article，Peter?
—Yes.It tells us how to save ________ earth.

A．an，an

B．an，the

C．the，an

D．a，the

3 . —How often does your brother use _______ Internet?
—He uses it at _______ least three times a week.

A．the; the

B．/ ; the

C．the; /

D．an; /

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

A．the; the

B．an; the

C．an; a

D．a; a

5 . _______ Changjiang River is one of ______ longest rivers in ______ world.

A．The; the; the

B．The; a; a

C．A; the; a

D．/; the; the

6 . There is no living thing on __________moon.

A．the

B．a

C．不填

7 . --- Look at ______ moon high up in the sky .
--- Oh, what ______ bright moon ! Let’s go out to enjoy the night, shall we?

A．a; the

B．the; a

C．不填; a

D．不填; the

8 . Frank knows so much about _____ earth although he is only ____eight-year-old boy.

A．an; the

B．the; an

C．an; an

9 . Do you want to travel to ______ sun some day?

A．a

B．the

C．an

D．/

10 . ---What are you reading, Tom?
---_____ book about _____moon..

A．A; a	B．A; the
C．The; the	D．The; a