---- ______ he dropped out of school?

----His family had run into financial difficulties.

A. Why was it that              B. Why was that   

C. Why was that it              D. Why was it

It’s not what he said but the way he said it __________ made me angry.

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

The computer was used in teaching. As a result, not only_________, but students became more interested in the lessons.

A. was teachers’ energy saved          B. saved was teachers’ energy

C. teachers’ energy was saved         D. was saved teachers’ energy

They began to think about______ could be made of these valuable materials.

A. how use       B. full use      C. better use        D. what use

         I can’t understand is         he wants to change his mind.

A. That, what          B. That, why         

C. What, what     D. What, why

 The thought ____ they would go abroad for a visit was exciting.

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

Some children want to challenge themselves by learning a language different from __________ their parents speak at home.

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

A warm thought suddenly came to me __________ I might use the pocket money to buy some flowers for my mother’s birthday.

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

---Dad, I'm confused what I am going to do after graduation.

   ---You'd better first explore your talents and get to know yourself so as to find out __________ your real interests lie.

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

As is recorded in history, silkworms（蚕）were first raised by a woman in _________ is today Hebei Province.

A. where                         B. the place      C. which          D. what