After months of voyage, Columbus arrived in ______ later proved a new continent．

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

It has been proved ___ eating vegetables in childhood helps to protect you against serious illnesses in later life.

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

I just wonder __________ that makes him so excited.  

A. why it does    B. what he does        C. how it is        D. what it is

I want to know ______the thief was caught on the spot.

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

----Did you remember to give Tom the money ? ---Yes,______I saw her ,I’m sure.

         A.so long as  B. so far as  C.the moment  D. no matter when

The poor young man is ready to accept ________ help he can get.

A. whichever      B. however         C. whatever         D. whenever

The second-hand car she bought was almost new ,______,it was in good condition.

       A.however   B.besides    C.though    D. therefore  (表示一种因果关系)

-----Which of these electronic dictionaries do you like most ?

      -------________.They’re both expensive and of little use.

         A.  None   B.Neither    C.All   D. Both

The book is meant to ________needs it .

 A.        who        B. whoever            C. whomever    D. whom

After Yang Liwei succeeded in circling the earth ,_______our astronauts desire to do is walk in space .

 A. where      B. what          C. that           D. How