The air is badly ________.And there’s more water _______ in the world.

－Where is your mother－She _______ the supermarket to buy some food.

It is obvious to the students ______ they should get well prepared for their future.[ ]

When will you go to the parents’ meeting—I ______ to give a talk at the meeting, so I will have to be there early.

g from his accent, he_______ be from Australia.