—         have you danced?—Since I was six.

— Peter, you feed the gold fish and the two little tortoises, ______?　— I did it in the morning; it’s a routine for me now．

— Must I come at four o’clock?— Oh, no, you ____.

. Reading books is very important for developing the students’ understanding of the world, _______?

---“Didn’t the robot have a rest?”---“_______. Because it never gets tired.”