I’m calling about the apartment you theother day Could you tell me more about it

The key _____ four modernizationslies _____ the science and education.

Once you __ working with the professor, you will find he is not as tough as expected.

下列各句中，没有语病的一句是（ ）

China Business Daily reported the 60% discounts on some Beijing-shanghai flights have now slipped back to 20% _______ one day in advance.