1. Facebook is a very famous social networking website founded in 2004 ________ millions of people interact with one another.
A. when B. that C. which D. where
2. ________ about the application of the strategy(策略), most teenagers are interested in the novel ________ the Second World War.
A. Concerned, concerned B. Concerning, concerning
C. Concerned, concerning D. Concerning, concerned
3. Don’t trust such people ________ praise you to your face but speak ill of you behind your back.
A. who B. whoever C. that D. as
