2．Great changes ______ in China in the past 20 years.
| A．took place | B．have taken place |
| C．were taken place | D．have been taken place |
The population of the country is 3 million, _____ Kooris.
| A．1 % of which were made up of | B．1 % of it were Kooris |
| C．and 1 % of which were made up of | D．1 % of them were |
In the market I found the prices of vegetables were ______ high.
| A．very too | B．fairly too | C．quite much | D．rather too |
I stood there patiently until he ________ his work.
| A．has finished | B．would finish | C．had finished | D．finishes |
It will be a long time ______- he returns.
| A．until | B．before | C．when | D．after |
_________ of us knows how many of them have been killed in that accident.
| A．None | B．No one | C．Not all | D．Not a one |