Great changes _________ in China in the last two decades.
| A．have taken place | B．took place |
| C．have been taken place | D．are taking place |
While reading, you should not always ___________ a dictionary to find the meaning of each new word.
| A．look up | B．turn to | C．look for | D．turn out |
. After dry days, everyone appreciates ______ when there is a timely rain.
| A．that | B．one | C．this | D．it |
—What about the picnic plan?
—Not ________ yet. It’s being discussed..
| A．decided | B．decide | C．deciding | D．to be decided |
Look at the new computers, of ______ none are produced abroad.
| A．them | B．whom | C．which | D．these |
Theory is based on practice and ________ serves practice.
| A．in turn | B．by and by | C．by chance | D．in this case |