Ⅰ.单句语法填空
1．________(concern)about Lucy，the teacher called her parents to find out why she was so often absent from class.
2．I've made a ________(complain)to the police about the noise.
3．What children learn from their parents has an important effect ________ them.
4．The book is so difficult; I can't take ________ what the author means.
