Only after the woman had her own child ________ how difficult it was to be a mother.

A. she realized         B. had she realized

C. she had realized      D. did she realize

 Mrs. White showed her student some old maps _________from the library.

A. to borrow        B. to be borrowed      C. borrowed       D. borrowing

She smiled happily，________ a set of amazing white teeth to us.

A．exposing                             B．being exposed

C．exposed                              D．to expose

 John Snow found that the polluted water was _________ for the outbreak of cholera.

A. to blame         B. to be blamed        C. blamed        D. blaming

 --Good afternoon. Can I help you?

--My bike is broken. I’d like to have it______, sir.

A. repaired         B. repairing         C. to repair          D. to be repaired

 ________by the beauty of nature, the girl from London decided to spend another two days on the farm.

A．Attracting              B．Attracted    C．To be attracted         D．Having attracted

 With a lot of difficult problems _________, the manager felt worried all the time.

A. settled    B. to be settled    C. settling    D. to settle

 _____ was obvious ______ the manager was waiting for LiFang to leave.

A. It, that                     B. This, that                  C. That, what               D. What, that

 _________ he took plane, he was frightened to cry.

A. First time    B. At the first time   C. For the first      D. The first time

 ________，they found that he was gradually recovering.

A．To their much delight     B．To much delight

C．To much their delight     D．Much to their delight