— Tom, are you going swimming with us?— I’d love to, but something important has ______.

(2013·陕西高考)Although Rosemary had suffered from a serious illness for years, she lost ________ of her enthusiasm for life.

It’s very wise of you to ________ well trained workers _____ untrained ones in the assembly line.

 There is ________ in his words.We should have atry.(2011·四川)

The government ______ air quality in urban areas from levels one to five: excellent, fairly good, slightly polluted, poor and dangerous.