Every device ______in the plane must be designed and made with great care so as to make sure that nothing goes wrong in operation.  

A. fitted  B. to be fitted      C. fitting  D. being fitted

Every device ______in the plane must be designed and made with great care so as to make sure that nothing goes wrong in operation.

 A. fitted           B. to be fitted      C. fitting          D. being fitted

Every device ______in the plane must be designed and made with great care so as to make sure that nothing goes wrong in operation.

1. A.
   fitted
2. B.
   to be fitted
3. C.
   fitting
4. D.
   being fitted