一、填空
1.The company _____ (target) by animal rights groups for its use of dogs in drug trials since 2018.
2.Students are always struggling _____ (balance) between study and after-school activities.
3.You'd better calm _____ and raise your voice when you give a speech.
4.Parents are _____ (concern) about their children's safety, diet and study.
5.When she agreed to marry him he felt he had achieved his heart's _____ (愿望).
6.The snake sheds its s once a year.
