[基础知识•夯实]
ⅰ.单词拼写
根据汉语注释及首字母提示写出下列单词的正确形式。
1. the meanings of words are complex, and you'd better_s______ them.
2. with the help of his friends, tom finally s______ the problem.
3. cyclists who give ________(信号)before turning or stopping help prevent accidents.
4. it seemed as if as soon as one problem was solved a new one________(出现)．
5. i haven't ________ (计算，估算) the cost that we will spend in travelling.
答案：1. simplify 2. solved 3. sign
