It takes years to _________ a good name but only seconds to destroy it. For example, some celebrities（名人）were caught taking drugs by the police.
| A．build up | B．take up | C．make up | D．put up |
The Canadian friends have given us a lot of books, few of _____ a bit difficult for us.
| A．them are | B．that is | C．which are | D．which is |
Would you like to _____ us in our discussion?
| A．take part in | B．join | C．taking part in | D．joining |
It’s said that corn was grown a lot in Tibet _______.
| A．in 17th century | B．in the 17th century |
| C．in 17 century | D．in the 17 century |
Rather than _____ on a crowded bus, he always perfers _____ a bike.
| A．ride; ride | B．riding; ride |
| C．ride; to ride | D．to ride; riding |
As I became older, I came to like ____ things.
| A．more and more simple | B．more simpler and simpler |
| C．much simpler ans simpleer | D．more and more simpler |