In the future

Perhaps people will be able to live on other ______________.

Perhaps __________ will be no water or air on the earth.

Perhaps there will not be __________ food for everybody.

Perhaps people will be able to grow vegetables in ___________ ___________.

Perhaps there will be no summer or winter. Then the weather will ____________ be too hot or too cold.

Perhaps people in different countries will be able to speak the _________ language. Then people will be able to understand each other ____________.