China _______ a sharp increase in the number of aged people over the past decade.
| A．sees | B．saw | C．has seen | D．will see |
Mencius believed that the reason man is different from animals is
man is good.
| A．that; that | B．why; because | C．why; that | D．which; that |
Neither we nor our father playing tennis.
| A．like | B．likes | C．is liking | D．are liking |
This is a process happens when land becomes desert people cut down trees and dig up grass.
| A．when; because | B．that; because of | C．when; because of | D．which; because |
The director thought I was referring to her,in fact, I was referring to the men on duty.
| A．when | B．where | C．which | D．while |
With several students , Mr. Smith came into the lab.
| A．follow | B．followed | C．following | D．to follow |