Using bicycles ______ greatly to people’s physical fitness as well as easing traffic jams.
| A．substitutes | B．attributes | C．distributes | D．contributes |
_______ is our belief that improvements in health care will lead to a stronger, more prosperous economy.
| A．As | B．That | C．This | D．It |
I’d appreciate ____ if you would like to teach me how to use the computer.
| A．that | B．it | C．this | D．you |
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 |