Mary got into acting purely _____________.
| A．accidental | B．accident | C．by accident | D．with accident |
_____is a good of exercise for both the young and the old.
| A．The walk | B．Walking | C．To walk | D．Walk |
________more attention, the work would have been done better.
| A．Given | B．o give | C．Giving | D．Having given |
Most air pollution is caused by the burning of _________ like coal, gas and oil.
| A．fuels | B．articles |
| C．goods | D．products |
I bought a dress for only 10 dollars in a sale; it was a real _________.
| A．exchange | B．bargain |
| C．trade | D．business |
—Shall we go out for a walk?
—Sorry. This is not the right _________ to invite me. I am too tired to walk.
| A．moment | B．situation |
| C．place | D．chance |