Just use this room for the time being, and we'll offer you a larger one ________ it becomes available.(2010·安徽)
| A．as soon as | B．unless |
| C．as far as | D．until |
We must take steps to prevent the __________ world population.
| A．exploded | B．exploding | C．explosion | D．explosively |
The amount of money that he saved reached _________ 30000 dollars.
| A．as many as | B．as much as | C．as high as | D．as far as |
It is pretty well understood_______controls the flow of carbon dioxide in and out of the atmosphere today．
| A．that | B．when | C．what | D．which |
Mary got into acting purely _____________.
| A．accidental | B．accident | C．by accident | D．with accident |
It is no use thinking about your ________ youth.
| A．gone | B．lost | C．missed | D．losing |