6．The train pulled _________ and all the passengers got off.

A．in   B．out    C．down D．on

7．We thought they had come to repair the phone, but ___________, they were thieves.

A．in addition       B．in vain          

C．in future         D．in reality

8．Fully ______ in looking after three children at home, she no longer has time to enjoy the various activities in the club．

A．attached        B．occupied       

C．contributed     D．devoted