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?

Ｉdon’t think Linda could have done such a stupid thing last night，_________?

The restaurant must be crowded from ________number of cars parked in front of it,________?

We have to camp near, ___?

—_______ do you go to school every day?—By bus.