1 . In communication, a smile is usually _____ strong sign of a friendly and _____ open attitude.

A．a; /	B．the; /
C．a; an	D．the; an

2 . ----Our boss says the company is at _________ crossroads.
----Yes, it is challenging and demanding, but we shouldn’t lose _________ confidence.

A．the; /

B．the; the

C．a; a

D．/; the

3 . When you finish reading this book, you will have _______ better knowledge of _______ first aid.

A．a, the

B．the, a

C．/, the

D．a, /

4 . Sarah looked at      finished painting with      satisfaction.

A．不填；a

B．a; the

C．the;不填

D．the;a

5 . Wouldn’t it be ____ wonderful world if all nations lived in ____ peace with one another?

A．a; /

B．the; /

C．a; the

D．the; the

6 . The old man watched the young boys playing _______ basketball with _______great interest .

A．a ; a	B．the ; the
C．/ ; /	D．/ ;a

7 . Many people agree that ______ knowledge of English is a must in _______ international trade today.

A．the, an	B．a, 不填
C．the, the	D．不填, the

8 . Susan, _____ university student from European, teacher me _____ art in he spare time.

A．an; /

B．a; the

C．an; the

D．a; /

9 . Some people fear that ________ air pollution may bring about changes in _______ weather around the world.

A．/; the	B．the; /
C．an; the	D．the; a