If we go on using energy so wastefully, ________ are that our oil wells will be dried up before new energy sources can be found to replace oil.

1. A.
   chances
2. B.
   difficulties
3. C.
   questions
4. D.
   problems

If we go on using energy so wastefully, __________ are that our oil wells will be dried up before new energy sources can be found to replace oil.

A. chances                 B. opportunities                C. questions                       D. problems

If we go on using energy so wastefully ,        are that our oil wells will be dried up before new energy sources can be found to replace oil .

       A．chances    B．difficulties      C．questions D．problems

If we go on using energy so wastefully, __________ are that our oil wells will be dried up before new energy sources can be found to replace oil.

A. chances             B. opportunities            C. questions                  D. problems

If we go on using energy so wastefully, __________ are that our oil wells will be dried up before new energy sources can be found to replace oil.

A. chances                 B. opportunities                C. questions                       D. problems

 If we go on using energy so wastefully, __________ are that our oil wells will be dried up before new energy sources can be found to replace oil.

A. chances             B. opportunities            C. questions                  D. problems

If we go on using energy so wastefully,        are that our oil wells will be dried up, before new energy sources can be found to replace oil.

A．difficulties      B．chances          C．questions          D．problems