1 . __________ __________ (担忧) her children’s safety, the mother let out a deep sigh and lowered her head. (根据汉语提示完成句子)

2 . As tourism develops, people are becoming increasingly more c________ about the environment. （根据首字母单词拼写）

3 . 经理生病住院了，他本应该多关注自己的身体健康。（should have done； concern）

4 . --Why do you look pale today?
--I was very ________my mother’s illness. I stayed awake last night.

A．concerned about	B．concerned with
C．concerned in	D．concerned to