There is nothing wrong with my bike,      ?

—I suppose he’ll pass the exam, _______________?   —Of  course he will.

—I like that green T—shirt. ________ is it?—It’s fifteen dollars.

---_______ are these apples ? ---Ten yuan . 

No one will be sad because humans will have learnt to fix many of the problems that affect us now, like war, pollution and hunger, ________ ?