No one was sure _____ Ron would come to the party or not.

   A. what time         B. whether        C. that             D. if

_____ he is very busy, he spends at least two hours every day surfing the Internet in order to find out the latest development in science and technology.

A. Even though                   B. When                       C. Unless               D. Whether

If you are able to talk to a friend over the telephone, you feel that you are close _____ the actual distance is not shortened.

  A. even if             B. so long as                   C.if                      D. as

You can come to the dance ______ you dress.

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

Would you be___ kind as to step this way please?

  A．as    B．very    C．so    D．too