Taxi is one of the most common means of city transport, so the increase of taxi _______ in Hangzhou has led to much public concern.

 Who would you rather ______ with the teacher about the problem?

In fact, I think it’s very much nicer without the naughty boy, if you don’t mind me _______ so. 

That hero who died in the war was so brave that he never _____ to the enemies until death.

Though John and David are twins, yet they differ widely _______ character.