What will you do if you have to____an invitation to a party-I think l will say sorry and tell the reason at the same time.

Ifyou______anyproblemswhenyouarriveattheairport,givemearing．

You will be late ______ you hurry up.

His health is improving day by day. It is quite ______ that the medicine has a good effect on his disease.

Vitamin D helps our bodies make a special chemical,and this special chemical, ____ , affects our brains,making us feel happy.