The book cost you 50 yuan, _______?

—Kate, do you know ___it is from here to the post office?—About twenty minutes’ walk.

Peter is never late for school, ____ he? _____. He always comes on time.

Tom used to be late, ＿＿?

—Hey, Paul! Don’t you remember me?—_________. You are Peter. We once were classmates.