Over years, scientists have made a great _____in the treatment of cancer.

Most air pollution is caused by the burning of ____ like coal, gas and oil. 

In the _____ of rain in the process of planting trees, you must stop.

This is my old photo of my aunt’s when she had _____. And now she has a few _____.

The British government often says that providing children with      to the information superhighway is of great importance.