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?

He knows so much about the story. He must have read the book,_____?

 –_______  your father?  –No, he is my uncle.

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

It’s fine today. Let’s go fishing,      ?