There is a way to get rid of the red color: 13. When a bright light is shone on the mechanophore, the broken bond is fixed - and the red color disappears. This self-healing may be a problem for engineers. They need to use the color-changer in big construction projects that will be 14 , in sunlight. And sunlight will make the mechanophores warning system useless.

　　Sottos and her fellow scientists still have 15 work to do before the color-changing molecules can be used outside the lab.

　　练习：

　　1. A measures

　　B accidents

　　C actions

　　D collapses

　　2. A they

　　B it

　　C some

　　D most

　　3. A with

　　B over

　　C at

　　D in

　　4. A before

　　B after

　　C once

　　D while

　　5. A together

　　B behind

　　C down

　　D apart

　　6. A contacting

　　B conducting

　　C containing

　　D considering

　　7. A controlled

　　B spotted

　　C repaired

　　D changed

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