(2013·江西南昌一模)Why ________ it get colder when we climb up a mountain? We are getting nearer to the sun!

There ____________ too much homework for us to do today .

I wonder if you will go to Linda’s birthday party-I won’t unless I ______ .

I think that something has to be done to stop the air from being polluted, ______ ?

Since there is always a power failure in the town, they have candles_______ in the closet