—Did you have a good time at the party?—Yes. We sang ______danced until late at night.

Learning to write is learning to think. You don’t know things clearly _______ you can write them down.

--- What is our head teacher like, do you know? --Oh, he is very kind, ________ he looks very serious.

______ we deal with our problems, we can easily become unhappy. 

 He was so tired that he fell asleep ___he went to bed.