There has been a collision ___ a number ？

There has been a collision ___ a number of ？

There has been a collision a number of ？

There has been a decline in local ______national advertising.A．thereforeB．soC．butD．and

There has been a ______ lack of communication between the union and the management.[2002]A

There has been housing development on a massive ________ since 1980.A range B scaleC de

In the past decades there has been a big_______.A