6. As there is less and less coal and oil, scientists are exploring new ways of making use ofenergy, such as sunlight, wind and water for power and fuel.
Jack, what about the lecture — It is the most inspiring lecture that I _________ since I came to this university.
set out to ___________ Liu Ming.
He became inspired when he thought about helping ordinary people ________ to cholera.
Is that your __ nice pictures B。