1 invented
2 it has gone
3 had gone-left
4 what did you do ... did you go
5 have you had
6 was looking
7 has been teaching
8 bought- haven't worn
9 saw-was - had seen-remembered-was
10 have you heard-was-died -wrote -have you read
11 what does this word mean -have never seen
12 did you get- it had already started
13 knocked-was-had gone -didn't want
14 he had never used - didn't know
15 went -needed-had been sitting