1 . She is reading ________ article about how to save ________ earth.

A．a; the

B．an; a

C．an; the

D．a; an

2 . London is in the south of England and it is on ________ River Thames.

A．a

B．the

C．an

D．/

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

A．a; an

B．an; a

C．an; the

D．a; the

4 . If we want to go on living on ________ earth, we should care about ________ environment.

A．/; /

B．the; /

C．the; the

D．an; an

5 . _____ sun is shining.

A．The

B．A

C．An

6 . — 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

7 . ______ moon goes around ______ earth.

A．The ; a

B．A ; the

C．An ; a

D．The ; the