Every ________ been tried to save the patient．

1. A.
   mean has
2. B.
   means has
3. C.
   mean have
4. D.
   means have

In order to keep the balance of ecosystem, every possible means _______to deal with the problems of the over-exploiting of natural resources.

A．has tried          B．has been tried      C．have taken        D．have been taken

Every possible means ________, but the teacher as well as the students ________ found a solution to the problem yet.

A. has been tried; hasn’t                B. has tried; haven’t

C. have tried; haven’t  D. have been tried; hasn’t

Every means        tried but without any result.

       A. have been B. is to be       C. are to be    D. has been