11. We........old textbooks to children in rural areas.
A.see
12.She.
A.opened
13.He
A.sings
14.Listen! The birds.
A.are sing
B.sing
15. Three years ago, my sister and I..
A.go
16.Mr Buong
A.doing
19.Mr Buong..
A.buys
17.Nam and his sister.
A.goes
20.There..
to complete the following s ...
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