We take our skin for granted until it is burned ________ repaired

geles Times reported that researchers may have found a way to ______ human life by changing certain genes, so that humans might expect to live twice as long.

Getting more information on how to use these tools can ______ your chances of success. [ ]

What is that building? –____________ the students have their dance classes.

Our school is so famous that ____people come and visit it every term.