`21`. Right

`->` Dẫn chứng: Last spring, Bill Lishman found sisteen young Canada Geese on his farm

`22`. Doesn't say 

`->` "Doesn't say" vì trong bài không nhắc đến

`23`. Wrong

`->` Dẫn chứng: All through the summer, he went on short trips in his plane and the young geese flew after him

`24`. Doesn't say

`->` "Doesn't say" vì trong bài không nhắc đến

`25`. Wrong

`->` Dẫn chứng: When the cold weather arrived in autumn,....The geese followed him all the way....left the geese in Virginia

`26`. Wrong 

`->` Dẫn chứng: Bill left the geese in Virginia and he returned home

`27`. Right

`->` Dẫn chứng: When he arrived back home, Bill found the geese waiting for him

Cảm động - ing TvT

`\color{pink}{\text{@Bulletproof Boy Scout}}`