----How many students are there in your class?---- __________ number of the students in our class __________ 40. 

Susan is          American girl. She plays          piano very well.

— What______useful dictionary for beginners of English! Where did you get it?— I bought it in the bookshop.

 My father can play_____ basketball well and my mother can play_____ piano well.

Please give me ________envelope, I want to write a letter to my father.