A new       to teaching languages is being used here, and it has turned out to be very helpful to the students.

She made a silly mistake because she hadn’t kept her       on her work.

The drilling in Antarctica dragged on slowly because of lack of money, equipment breakdowns, environmental ______ and severe cold.

Shanghai has become a (n) ________ of the world’s attention with the 2010 Expo being held at the moment.

Though lacking________, the young teacher manages the class very well.