. The teacher’s lecture on American history was three hours long, and Mary felt very _____

A)by chance B)by nature C)in advance D)on purpose

A) to spend B)to be spending C)to spending D)to have spent

A) in line with B)in case of C)for the sake D)at the risk of

A) of B)at C)for D)against

 A)of B)about C)to D)for

 A)than B)to C)of D)at

 A)for B)on C)with D)at

A)helping B)to help C)to helping D)in helping

A) with B)through C)in for D)from 

A)besides B)except C)except for D)away from