The shy girl is not good at dancing, but she's learning __________ her friend's direction.
I don't think the experiment is __________ failure. At least we have gained __________ experience for future success.
The party last night was __________ big success and all the people present had __________ great fun.
The two sportsmen congratulated each other __________ winning the match by shaking hands.
The development of the city's industry __________ its environment pollution.
He has worked __________ the maths problem for nearly an hour but he simply can't work it __________.