—Will you fix up the machine according to the ______, David ? –No problem.

---What _______ do you have for Daniel?--- I think he should study harder than before.

We don’t sweep the floor for a few_________ .     

 --- What class are you in? --- I’m in ________________, Miss Li’s class.

—Hello, Betty. Is your mother a teacher?  —No, she is a doctor in a _____.