Ex 1: 1 By the time I got
to the party, most people had gone home.
2 When Glen (had) opened
the book, some pages fell out.
3 When the fox (had)
disappeared, we went back to look for it.
4 When she (had) picked up
her bag, the handle broke.
Ex 2: 1 had typed, gave 2 had
come, started 3 had checked, went 4 had turned, caught 5 had collapsed, phoned
6 had eaten, picked