34. The designs of the new tools should be ________ carefully, so that we can pick out the one that suits our work.

A. experimented            B. examined

C. exercised               D. tried

The designs of the new tools should be_____carefully ,so that we can pick out the one which suits our job.

A.examined　 B.tried on　 C.tested　　 D.experimented

34. The designs of the new tools should be ________ carefully, so that we can pick out the one that suits our work.