Most girls like to sleep with the lights on, because they are ________ the dark.

Can you tell me when ________ play with me?— I can play with you when my homework ________.

Today the forests are getting fewer and fewer. We must down too many trees.

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

Do you know the young man well?—Sure, we __________ friends since we met in Nanjing three years ago.