Many a problem has ______ because of poor planning.A．arisenB．risenC．raisedD．aroused

There are many ways _____________ the problem.A、to solveB、solvingC、solve

The quality of many people’s lives has become worse in some ____ because of technological progress.

The process of urbanization has caused many problems, the major one is ______.A．economyB．t

The increase in student numbers ______ many problems for the universities.A．forcesB．presse

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

Anna Douglas understands the problems of old people ______.A．because she likes their music