III -
41.A: will->would
42.A: uses->used
43.B: about->of
44.A: me->I
45.B: starting->started
46.A: when->where
47.A: enough tall->tall enough
48.C: in->on
49.C: couldn't->can't
50.B: mustn't->shouldn't
IV -
1.T
2.T
3.F
4.T
5.F
6.F
7.F
8.T
$Answered$ $by$ $Mai$ $Chi$$.$