Cloning humans has been _____ in the science world for many years and it is likely to continue .
| A．ridiculous | B．contemporary |
| C．controversial | D．contradictory |
It is China _______ is believed to be able to lead the world out of the financial crisis.
| A．which | B．that | C．/ | D．where |
---- Where is Jack?
----He _________ football on the playground with those AFS students, but I am not sure.
| A．must be playing | B．must have played |
| C．may be playing | D．may have played |
In our class there are 60 students, of ____________ two thirds are boys.
| A．which | B．them | C．whom | D．who |
Mary wrote books to earn money while John gained his wealth _________ selling Mary’s works.
| A．on | B．by | C．in | D．through |
I hated it when people don’t ___________ their promises.
| A．carry out | B．look out | C．run out | D．find out |