2a(tham khảo c2)
3d
4c
5b
8d
10d
13c
14a
17c
23b
28c
30b
31c
34a
40b
41c(tham khảo c41)
42d
43c
44a->to doing
45c->sunbathing
47d->looking after
48a->Let
49b
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