31. _____ our earth, otherwise it will be no longer fit for us to live on.
Without the air to hold some of the sun's heat, the earth at night _________,too cold for us to live.
_________his teacher, Li Ming wouldn't have passed the Englishexam so easily.
The beautiful lady _________ to be a skilled thief.
It is those who are _________ of the matter that should answer for it, so don't be worried.
It is believed that the prosperity of tourism is sure to _________ thedevelopment of the economy in the poor countryside and createmore job chances for those bread winners.