-----You must have enjoyed using your new camera on the trip to Tibet. ----- I would have, but I _____ it in David’s car when he drove me to the airport.
--- Where did you get to know her? --- It was on the farm _____ we worked.
Food safety is _______ important, so the government spares no effort to prevent food pollution.
When he woke up, he found his watch gone. It seemed that he suspected me ________ it.
We must _________ from old convention(传统)and adopt as many modern techniques as possible.
________ to the sunlight for too much time your skin will get burnt.