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Lesson 31 - How long does it take? - Exercise 9

Watch the video, then answer the question.
 
There are 2 questions in this exercise. The first question is about prepositions, and the second question is about the title of this lesson.

foot.jpg
On foot
Means of transportation: in general, use by: by car, by bike, by train, by plane, etc., but on foot.
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Double-click on any word for an English definition, or translate.
Teachers: please note that translation is not a part of the Real English learning methodology.