Add the suffix “-en” to the words given below. Then complete the following sentences with the words thus formed. Change the form if necessary. 后缀-en 接在某些名词、形容词后面构成动词,意味:使成为...,使变成...。e.g:strength+en=strengthen(使增强);shorten (使缩短);sharpen(削尖) dark hard broad fright length 1. Can you ___________ the skirt for me? It is too short now. 2. The thought of war ___________ me. 3. You should ___________ your horizons by traveling more. 4. Why does the sun lighten our hair, but ________ our skin? 5. Sorrow and trouble either soften the heart or ________ it.