Its an_____difficult problem, which even many professionals cannot work out.A．exceedinglyB

In a______market, its difficult to sell goods unless you lower your prices.A．depreciatedB．

The term "leadership" is one of the most difficult in an【M1】______ educational administra

Its such a difficult problem______no one can work it out.A．asB．thatC．soD．this

This problem is very difficult to deal with. It’s really_______.A、convincingB、seriousC、t

We want to know what is the best way to find______to this extremely difficult problem.A．an

So fast _____it is difficult for us to imagine its speed.A.does light travel thatB.light travels th