--My parents will go to Mount Emei for ____ holiday.  --That means you will have to be at home by _____.

—Is this ________ key, Tom? —No, that one is ________.

The students were all tired, but ___ of them stopped to have a rest．

There is ___ food in the fridge(冰箱). Let’s buy some.

I find        difficult for Tom to reach that picture.He is a little short.