We are very _______ that many students use the Internet every day.

We must try our best to stop pollution ______ a low-carbon(低碳)life.

Americans eat vegetables per person today ______as they did in 1910.

Could I use your computer, Susan? —Sorry, I’m going to _______ it now. You can use it tomorrow.

Hea bike in the street when he was hit by a car.