Tom is a promising student. I am sure that with his________effort, he will make a very successful scientist.
| A．usual | B．constant | C．content | D．normal |
The lecture, ________ at 7：00 pm last night，was followed by an observation of the moon with telescopes.
| A．starting | B．being started |
| C．to start | D．to be started |
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 |