f the inhabitants can’t afford to buy houses of their own, because the price is rising ________.

.To tell you the truth, I became a college student at 15.______.

下列各句中，没有语病的一项是（ ）

He postponed his holiday so as to __________ the deadline for his work.

13 ___ had they reached the 30th floor ____ they realized that they had forgotten to take the key