1 . ________ moon is very bright at night.

A．A

B．An

C．The

2 . —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

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

A．a

B．an

C．the

4 . Amy is _______ unusual girl. She has traveled to 15 countries in _______ world.

A．a; the

B．a; \

C．an; the

D．an; one

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

A．an; the

B．the; an

C．an; an