When people cut down big trees, new trees should be planted. ,they will have no trees to cut down in the future.
The lift in that tall building went wrong and got trapped _____ floors. People in it had no way to get out.
--- I saw your uncle take a taxi to the airport. Why didn’t you drive him there ? --- I ___. But my car ____.
If you want to book tickets for the 2012 Olympic Games, just call 60952012. It _____be simpler.
—Mom,may I play computer games just for a while? —________!Dad is writing his paper.
The employment rate has continued to rise in big cities thanks to the efforts of the local governments to increase________.