The students entered the classroom, smiling and ___, and ___ down to have their lessons.
Crow considers the TV shows “a beautiful model of_______ I call high-tech learning. They can teach children about things in ways traditional education can’t.”
Over one thousand passengers remained_____ on trains for hours without air conditioning because of power failure on the railway,
In order to help the police, the eyewitness described what he had seen very carefully not to______ any key clues.
Diaoyu Island issue, unless ________ properly, will directly affect smooth development of relationships between China and Japan.
Netizens are frequently reminded to be ________ about revealing (透露) their personal information on the Internet.