There are many theories that______to be able to predict whether you will give birth to a g

The volcanoes theory cannot convince everyone because______.A．there are gaps in the volcan

There are many theories about the beginning of drama in ancient Greece. The one most【C1】__

There are many ______ here.A、boxB、boxsC、boxesD、boxies

Today, there are nearly as many educational opportunities in the______industry as there ar

There are among many American families______.A.li

Many experts do not believe that______.A．there ar