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.
Up to now. the program has saved thousands of children who wouldhave died.
Walking alone in the dark,the boy whistled to______ his courage.
If he ________that he________to work there then,everything would be OK now.
When he was there,he ________go to that coffee shop at the corner after work every day.
---What happened to the young trees we planted last week? ---The trees ________well,but I didn't water them.