It is a good habit to go to ______ bed early and getup early.

These instructions should be made more _____, so that the primary school students can understand it. [ ]

I use a clock to wake me up because at six o’clock each morning the train comes by my house.

36. ______ has helped to save the drowninggirl is worth praising.

He asked me___ I would go to Beijing by air the next day。