It's a pity that some students waste energy _________ on line.
A.to chat B.chatting C.chat D.to chatting
During this special time, the way people ________each other has changed, we don't shake hands or hug any longer.
A.greet B.accept C.recognize D.help
—Look at the clouds in summer twilight (黄昏)! They are so beautiful.
—Yeah. The beauty _______ ten minutes.
A.lasted B.lasts C.has lasted D.will last
While my mother ________ some shopping yesterday, she happened to meet an old friend of hers.
A.did B.was doing C.would do D.had done
As I'm busy with my assignment, you __________ have your private time in your own room.
A.must B.can C.need D.should
We believe we are ___________ what we do, no matter how we feel.
A.unaware of B.sorry for C.independent on D.responsible for
