Bob promises to join in the football match ________ he has to help his parents on the farm.
— Sandy, do you ________ tomorrow’s party?— Yes. Everything is OK.
Mr Wang is ________ Maths teacher. He teaches ________ Maths.
— Millie, ________ late for school again.— Sorry, I won’t.
There are nine ________ students in our school.
— Can I borrow ________books about biology from you?— Sorry, I don’t have ________.