8.
1) hadn't been signed (здесь думаю, так как есть "yet" нужно present perfect, а так как здесь reported speech, present perfect переходит в past perfect).
2) is it lost
3) was given
4) are bought
5) is built
6) had been finished (сделаны до того, как учитель вошел?)
7) was cleaned
8) are grown (в значении выращиваются)
9) was written
10) are put
9.A
1) punishment
2) hardly
3) rejected
4) lasting
5) dangerous
6) important
9.B
1) angry
2) thought
3) constructive
4) feeling(s)
5) harmful
6) different
7) situation