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______ your plans look good, you still need to do some revision work on it.

A. If                            B. Once                        C. Although           D. Since

True friendship is like sound health, whose value is seldom known        it is lost.

A. when                B. though                            C. until                 D. unless

Many people firmly believed ______ a healthy lifestyle can improve the quality of life.

A. that                  B. if                             C. how                  D. why

The question came up at the meeting ______ we had enough money for our research.

       A. whether         B. that                   C. which          D. what

– I wonder how much you charge for your services.

   -- The first two are free________the third costs $30.

   A. though          B. until           C. while                      D. before

--Would you please explain to me about the difference between the two phenomenon?

   --I’m sorry, but that’s just _____ I’m puzzled about.

A. why          B. what             C. which          D. where

Worldwide markets get tighter and the pain only lasts longer ______ international cooperation is strengthened in no time.

A. because               B. if                         C. unless                 D. when

______ makes the people who find value in hardships different is that they are able to combine what happened with the story of their own life.

A. It                              B. What                    C. That                   D. Which

______ strong-minded the teachers are, they should give their students enough time to share their ideas in class.

A. However             B. Whatever              C. No matter           D. Although

I want to be very careful to talk only about ____ we've formally tested.

A. which                      B. that                          C. what                        D. whether