He ___ go to work by bus, but now he ___ riding a bicycle to work.
| A．used to; used to | B．used to; is used to | C．is used to; used to | D．is used to; is used to |
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 |
The doctor was reading an article ______ the class.
| A．for | B．by | C．towards | D．to |