He had his camera ready ____he saw somethingthat would make a good picture．

Oh，my God! The ceilingin and the kitchen is floodedCome quickly，Jack!

These new types of energy from the sun, wind and water cost very little and will never ________.

We don’t know how to prevent the flu. Shall we ask Doctor Wang Hai for______

He was angry _____ your work. He said thathe _____ at all.