The roof began to _____ because of the great weight on it.

According to the author, the concept of "aggression" ______.A．is hard to define because it

The factory had to lay ______ one third of its workers because the demand for its products

The government tried to______the book because of the information it contained about the se

Because of its geographical position, Germanys______on the situation in Eastern Europe is

Hardly had we got on the bus______it began to rain.A．whenB．sinceC．butD．before

The selection of an oil from the _____ depends to a great extent on the operating conditio