1 went, were, enjoyed, were skiing
2 met,
3 where did you spend last sunday?
4 were, were
5 was playing, came, invited, accepted
6 rang, asked
7 came, was waiting
8 was going, broke
9 walked, were listening, were eating chips and drinking,
10 was going, met, wasn't going
11 what were you doing ..., happened, was walking
12 left, took