Điền các giới từ thích hợp vào chỗ trống :
1. My mother takes care ____ the family
2. she smiled ____ the child and said "Hello"
3. I'm really worried ____ my brother
4. Milk is good ____ your health
5. Most childrent are scared ____seeing the dentist
6. The dentist looked ____ my teeth
7. Minh has an appoinment _____ 10.30 this morning
8. Dr. Lai filled the cavity _____ Minh's tooth
