Only when the work is done ______be able to go back home.
These natural disasters have warned us that everyone should start to protect the_____ immediately.
There __________ still some milk in the fridge. It’s not necessary to go to the store today.
—__________ T-shirt do you like better, the red one or the blue one?—I prefer the red one.
Your English teacher has never lost his temper, ___________ he?
You had better ____________ because you have to drive back home.