Поставить в подходящую форму слова, очень необходимо без ошибок !!! Заблаговременно

Поставить в подходящую форму слова, очень нужно без ошибок !!! Заблаговременно спасибо!!
Варианты ответов:
1. can't., couldn't, mustn't
2. are building, have been building, had built
3. who, whose, which
4. will get, get, will have got
5. not as, more, -
6. such an, such, so
7. mustn't, won't have to, won't be able to
8. has been invented, is invented, has invented