I:
1.enjoyed.
2.is taught.
3.is being considered.
4.has taught.
5.was built.
II:
6.New students are always welcomed by the teacher.
7.The problem is being studied carefully by the scientists.
8.The phonograph was invented by Thomas Edison in 1877.
9.Two children were found in the forest by the police.
10.Your order will be sent as soon as possible