He is the only one of the students who _______ a winner of scholarship(奖学金) for three years.
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.