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was
were
could
couldn't
1.play--
2.look--
3.miss--
4.perform--
5.live--
6.hope--
7.buy--
8.dance--
9.study--
10.worry--
11.stop--
12.plan--
13.am--
14.can--
15.sing--
16.are--
played
looked
missed
performed
lived
hoped
bought
danced
studied
worried