Effective measures have been taken to prevent _______pollution.
| A．exhausted gas | B．exhausting gas |
| C．exhaust gas | D．exhaustion gas |
As the busiest woman in Norton,she made_________her duty to look after all the other people’s affairs in that town.
| A．this | B．that | C．one | D．it |
The chairman thought necessary to invite Professor Smith to speak at the meeting .
| A．that | B．it | C．this | D．him |
—There is still a copy of the book in the library. Wall you go and borrow ________?
—No, I’d rather buy ________ in the bookstore.
| A．it;one | B．one;one | C．one;it | D．it;it |
The information on the Internet gets around much more rapidly than ____ in the newspaper.
| A．it | B．those | C．one | D．that |
To save class time, our teacher has ________ students do half of the exercise in class and complete the other half for homework. .
| A．us | B．we | C．our | D．ours |