The book is not easy.____ it's rather difficult.

A. On the one hand                                                     B. On the contrary 

C. On the other hand                                                           D. On the other contrary

___he daydreamed, Peter saw figures in the sky.           

A. Until            B. Since          C. While          D. During

_____most students, she was always well prepared and never came to class late.

A. Like                        B. As                          C. For     D. To   

To tell you the truth, I have nothing to do ____ it.

A.about          B.with                              C.for                     D.of

The teacher is busy ____ teaching.

A.with                        B.for             C.on                 D.of

We go to school ____ a bike.          

A.in                B.on              C.by             D.ove

To understand the grammar of the sentence，you must break it______ into parts． 

A．down          B．up          C．off           D．out

 2. “_____ when does the pub stay open？”  “About midnight.”

    A. Since. B. Before

    C. Until. D. After

The trouble is ____ we can not find such an expert.

A. why                 B. that                  C. where                  D. /

They were surprised that a child should work out the problem they themselves couldn’t．

A．once B．then C．while D．if