_____ is known to everybody that the moon travels round the earth.

—Johnson, there’re a lot of chairs over there. Go and fetch ________ for me. —Why ________ ? Mike is sitting there doing nothing. 

— Why can’t the boy understand what the American teacher said?— Because he is a beginner, _______ he knows ________English.

---Susan, go and join your sister cleaning the yard. --- Why ___? John is sitting there doing nothing. 

---Keep _____ in mind that you have to be home by 10 o’clock. ---Ok, I will.