Who will be offered the position of manager when it becomes ________-A dedicated person with rich work experience．

It is widely known that burning coal for electricity is one of the main causes for global warming , but we can’t ignore the cars’ _____ to the greenhouse effect.

They decided to leave the waiter a big _____because the food and service had been excellent

Why did you laugh just now—Ted wanted to tell us _____ very funny story， but he forgot ______ ending himself.

Without the ‘ greenhouse effect’, the earth ____ be about thirty-three degrees Celsius cooler than it is.