You and I could hardly work together, _____  ?

---____do you go to work?---I take a bus.

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

—        is that girl?—Oh , she is my friend , Maria.

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