There is little doubt in your mind that he is innocent, _______?

Since it will take years to know the effect of genetically modified food, it’s more sensible to give it a second thought before we eat it,        it?

—She has gone abroad, ______?—No. She is still teaching us English at our school now.

----He’s never sung English songs before, __________he? ----_________. It’s his second time to sing in English. 

–I don’t suppose he could have done well in the exam last week, _____? --______, he almost failed the exam.