I heard a native English speaker saying

pop it into the bin meaning throw something in the trash bin.

1. Is it a proper English adult and children should pick up?

2. Any other ways in using pop...into in common use?

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go to the loo for going to the washroom.

3. Is it a proper English adult and children should pick up.

4. Is I want to go to the loo in proper English structure?
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5. Are the above questions in right structure?

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