将下列句子变为主动语态.必要时加上主语.急！

1many countries sent up man-made satellites to circle the earth.
2did the police search the house very carefully?
3since 1976 they opened up some new oil fields
4Liszt pointed out a few small mistakes about her playing piano
5since 1990 they put up many new building

1.Man_made satellites were sent up to circle the earth by many countries.
Many countries sent man_made satellites sent up to circle the earth

2.was the house searched very carefully by the police?
Did the police search the house very carefully?

3.some new oil fields have been opened up since 1976.
People have opened up some new oil fields since 1976.

4.a few small mistakes about her playing the piano were pointed out by Liszt.
Liszt pointed out a few small mistakes about her playing the piano.

5.so many new building have been put up since 1990.
People have put up so many new building since 1990.

1、Many countires sent