67.I consider____ my duty to help you．
| A．it | B．this | C．that | D．its |
We must do something to ________ the factories sending out poisonous gases so as to keep the city clean and beautiful.
| A．keep | B．protect | C．permit | D．prevent |
They will move to a new apartment next month. It is _________ the one where they are living now.
| A．twice the size of | B．twice as bigger as | C．twice the size as | D．twice as bigger than |
As we know, the 2010 Word Cup _______ in South Africa on June 11, 2010.
| A．takes place | B．took place | C．is taken place | D．was taken place |
---- Liu Qian has just come back from Canada and she looks very excited.
---- She ________ her trip very much.
| A．should have enjoyed | B．might enjoy | C．must enjoy | D．must have enjoyed |
The meeting started at ten o’clock, but the chairman has not _________ yet.
| A．turned up | B．turned down | C．turned out | D．turned off |