Change these passive sentences into the active voice.
1.Many bridges will be built by the workers next year ....................the workers will build many bridges next year.....................
2.Nam is going to be invited to the birthday party by Hoa ...............hoa is going to invited nam to the birthday party.........................
3.English is taught by Miss Hong this year ...................miss hong teaches english this year......................
4.Flowers in the garden are cut by Lan's grandmother every mornings ....................lan's grandmother cuts flowers in the garden every mornings.....................
5.Rubbish mustn't be thrown carelessly by the residents ............................the residents mustn't threw rubbish carelessly.............
6.These doors should be shut before 9 pm ...............they should shout these doors before 9 pm..........................
7.A lot of work is done by the secretary every day ..............the secretary does a lot of work everyday...........................
8.Many lakes and rivers are polluted by pollution from factories ...........................pollution from factories pullute many lakes and rivers ..............
9.Many trees are cut down to make paper ........................they cut down many trees to make paper.................