__________ our earth, or else it will be no longer fit for us to live on.
You can try to guess the meaning of ______ words you don’t know from ______ passage.
--- What do you think made Ceha so happy? --- a prize in the recent competition.
— Why not have a new machine designed? —__________. I’ll have someone do it soon.
The newcomers found if impossible to _______themselves to the climate sufficiently to make permanent homes in the new country.
_____no point in beating around the bush. Let’s ________.