Ⅰ.单词拼写
1．His whole life is dedicated to ________(科学的) research.
2．The scientist ________(分析)the milk and found it contained too much water.
3．He is ________(专业的)in teaching English，so many teachers like listening to his lectures.
4．All great leaders share certain ________(特征)which must be seen as the key to their success.
