during； unless； sky； time； arrive； proper； put up |
（1）Hurry up， Harry．Our friends in half an hour．
（2）I usually sleep with the window open it's really cold．
（3）There we tents and made a fire to keep us warm．
（4）The students who are good at writing can always use words ．
（5）Because of the good environment， it is easy for us to see the blue now．