Question

giúp mình phần này nữaaaaa

Answer 1

1 saw

2 do - do

3 Did - watch

4 was

5 were you doing

6 have traveled

7 have heard

8 was listening

9 discovered

10 had finished

11 haven't found

12 hasn't met

13 finished

14 had taken

15 went - had called

16 had gone - sat down and rested

17 saw - had talked

19 got - had gone

20 has taught - graduated