Answer:
The sentence that best shows the thrush's idea about making a nest is: "At that, the thrush said, "Oh, that's how it's done," and away she flew." This sentence indicates that the thrush learned how to build a nest by watching Madge the magpie, and it suggests that the thrush is now confident in her ability to build a nest.
Step-by-step explanation:
This sentence indicates that the thrush learned how to build a nest by watching Madge the magpie, and it suggests that the thrush is now confident in her ability to build a nest.