______is known to us, he is the top student of our class.
| A．It | B．As | C．This | D．That |
Nowadays people sometimes separate their waste to make it easier for it to _____.
| A．reusing | B．reused | C．reuses | D．to be reused |
Some people fear that _____ air population may bring about changes in _____ weather around the world.
| A．/; the | B．the; / | C．an; the | D．the; a |
How much ______ she looked without her glasses!
| A．well | B．good | C．best | D．better |
----What is the price of petrol these days?
----Oh, it _____ sharply since last month.
| A．is raised | B．has risen | C．has arisen | D．is increased |
The practice of hanging clothes across the street is a common _____ in many parts of the city.
| A．sign | B．view | C．look | D．sight |