The earth became so violent that it was not clear_________ the shape would last or not.

    A. if               B. how          C. whether      D. why

 The earth became so violent ____it was not clear ____ the shape would last or not.

A. which; whether      B. that; what   C. what; if     D. that; whether

The earth became so violent ____it was not clear ____ the shape would last or not.

Between 4.5 and 3.8 billion years ago, the earth became so ______ that it was not clear whether the shape would last or not.

A. genuine      B. slight        C. solid          D. violent