As far as we know, half of Canadian teenagers do not get enough sleep on school nights, _____?

I need a friend with whom ____ my sorrows and happiness.

---________ pieces of bread do you want? ---Two, please. And ________ are they?

---John and Tom, you two clean the classroom today, _____? ---But we cleaned it yesterday.

---            has your grandma been like this?   --- Since last night.