Schools should be lively places where individuals are encouraged to ______ to their greatest potential.
| A．cultivate | B．accelerate |
| C．expand | D．develop |
You cannot accept an opinion ______ to you unless it is based on facts.
| A．offering | B．to offer |
| C．having offered | D．offered |
The sunlight is white and blinding, ________ hardedged shadows on the ground.
| A．throwing | B．being thrown |
| C．to throw | D．to be thrown |
________ with care, one tin will last for six weeks.
| A．Use | B．Using |
| C．Used | D．To use |
Every day ________ a proverb aloud several times until you have it memorized.
| A．read | B．reading |
| C．to read | D．reads |
All flights ________ owing to the heavy fog, many passengers could do nothing but take trains.
| A．to be cancelled | B．were cancelled |
| C．have been cancelled | D．having been cancelled |