Образуйте причастие II от следующих глаголов.
a) to hope, to stop, to produce, to listen, to open, to study, to concentrate, to determine, to start,
to develop, to play
b) to be, to have, to do, to get, to come, to meet, to know, to make, to cut, to go, to see, to buy, to
begin, to choose, to say, to sell