It’s absolutely unacceptable to sacrifice people’s life and health________ the economic developmentin any case.[ ]

People are often at a loss when frequently seeing smog level predictions ________ each other in different official forecasts.

Nancy quickly ________ the door and put down her school things.

_____ in London, he was eager to see the Big Ben[ ]

Lily and her sister look the same.I can’t tell one from________．