根据汉语或首字母提示，写出下列单词
1．Heat gradually destroys(破坏)vitamin C.
2．We followed his tracks(足迹)through the snow.
3．His parents and his little brother lost their lives in the disaster(灾难)．
4．The reporter's words have shocked(使震惊)all of the scientists.
5．They built a rough shelter(庇护处)from pieces of old wood.
6．It was quite an event when a woman first became prime minister.
7．Our country is a developing nation．
8．Even if earthquakes often happen in that country，they seldom cause serious damages.
9．They don't have enough electricity，so the villagers go to bed early.
10．Luckily，the little girl was rescued by a kindhearted man.
