1) had known
2) was watching
3) has increased
4) will have typed
5) is modeling (не уверена)
1) They were chatting as if they … each other all their lives. (had known)
2) I … the U2 concert on TV on a Friday evening. (watched)
3) The number of people over the age of eighty … considerably in England. (has increased) (is increasing) - оба возможны
4) I … this business letter by lunchtime. (had typed) (will have typed) - оба возможны
5) Paul Smith … clothes for Vogue next year. (will model) (is modelling) - оба возможны