After the earthquake passed away, all the villages and towns were _____. And no being was seen.
A. in ruin            B. in ruins             C. at ruins         D for ruins

Class 3 declared themselves ____a responsible classmate as monitor of the class.

A. in favour of      B. in honour of     C. on account of      D. on behalf of

I’m sorry to have hurt you, but I didn’t do it ________.

A. on purpose             B. in common             C. on occasion              D. on the purpose

She may have missed the train,____ she won’t arrive for another hour.
A. whose case　　　 B.in which case　　　 C. in any case　　　 D. in that case

 He will be engaged _______ Mary and is engaged _______ it.

A. to; to                       B. in; in                 C. to; in                 D. in; to