1 . There is a/an _________ increase in the numbers of Internet users in recent years.

A．diverse

B．ample

C．casual

D．sharp

2 . I wasn’t aware that I would be paying-you certainly didn’t make it ________.

A．explicit

B．ample

C．diverse

D．sharp

3 . Each of these arguments may appear ______ on the surface, but they don’t stand up to the test.

A．stable

B．ample

C．valid

D．creative

4 . From the course of human development, the ultimate aim of the human race is to pursue the spiritual joy based on ______ materials.

A．artificial	B．primitive
C．relevant	D．ample