Just use this room for the time being, and we'll offer you a larger one（）it becomes available.
| A． | as soon as | B． | unless | C． | as far as | D． | until |
They were made ____ fourteen hours a day.
| A．work | B．working | C．worked | D．to work |
Why not ____?
| A．let him to go home | B．to let him go home |
| C．let him go home | D．to let him to go home |
The headmaster’s words are quite _____.
| A．encouraged | B．encouragement | C．encouraging | D．encourage |
--Do you often hear John ___ in his room? --Yes. Listen! Now we can hear him ___ in his room.
| A．sing; to sing | B．singing; singing | C．sing; singing | D．to sing; singing |
The scientist suggested ____ the experiment in a different way.
| A．do | B．to do | C．doing | D．done |