You ______ worry about their safety.They are old enough to take care of themselves.
It’s nothing unusual to experience failure, and _____ ought we to be so discouraged.
Most products, ____ which this is one example, sell well, _______.
-- Why do you look so worried? -- My computer broke down and my essay _____ since.
The company has just launched an advertising campaign to ____ their newly produced bicycles.
–Peter, I’d like to have a talk with you tonight. – ______. Have what with me?