Half the world’s population ______ water shortages within 15 years according to the World Bank, just one of many recent alarming reports on the world’s fresh water supply.
When we were young, every evening my brother and I ______ stay at home waiting for my mother?
—Are you satisfied with what he did? —No. It couldn’t have been _____.
This year __________ to be another good one for harvests.
Perhaps it is true that nobody in the world knows exactly how the earth __________.
—Why don’t we choose that road to save time? —The bridge to it __________.