---This is my father ---Hello , ____ Liu.
— Mr. Lee ____ to a student when I entered the classroom this morning.-- He is very patient ____he is young.
— The doctor told me____ too much but I find it difficult.— The doctor is right. The less you drink, ____ you will be.
—Must I return the book this week?— No, you ____. You can ____ it for 20 days.
—Who is ___ English teacher?—Well, it's Mrs. Green. She teaches ____ English very well.
–Would you like some coffee or tea?–_____. Water is OK.