Объяснение: 1.
1) House was built by Frank.
2) The DVD recorder wasn't repaired by a mechanic.
3) Rucksack is put on the floor by Sue.
4) The match was lost last week by them.
5) Good stories are told by Grandmother.
6) The children will be looked tomorrow by Sue.
7) The children aren't took to the cinema every week by Mary
2.
1) A new student WAS introduced to our class yesterday.
2) A prize WILL BE GIVEN to whoever solves this equation.
3) After an hour and a half the essay WAS WRITTEN.
4) Algebra and Geometry are teachING in the seventh form.
2. are, were
3. is, was
4. were, is