-----      of shoes do you wear?               -----Size 7.

 -----Li Ping told me that he overslept this morning. -----Oh, he rarely used to oversleep, ________?

---____________do you usually read English in the morning?---About half an hour.

-----      will your father be back from work?-----In half an hour.

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?