Without facts, we cannot form a ______opinion, for we need to have factual knowledge___ our thinking.

    A. knowledgeable; based on             B. sound; which to be based on

    C. worthwhile; upon which to base  D. valuable; upon which to be based

Without facts,we cannot form a worthwhile opinion,for we need to have factual knowledge ______ our thinking.

A.upon which to base                                       B.which to be based on

C.which to base on                                           D.to which to be based on

Without facts, we cannot form a worthwhile opinion, for we need to have factual knowledge _____ our thinking.

A. upon which to base                          B. which to be based on

C. which to base on                             D. to which to be based on

Without facts, we cannot form a worthwhile opinion for we need to have a factual knowledge ________ our thinking.