Her mother is very strict her. A. on B. in C. with
--What __________ the number of students in your school? --More than 2,000. And a number of them __________ listening to English songs.
--The classroom is __________ clean __________ it was yesterday. --Sorry, I forgot to clean it.
--Will you please give me some ideas on __________ English at home? --Well, do a lot of reading and listen to English programs.
--What beautiful shoes you’re wearing! How much are they?--They only __________ 10 yuan.
I think _________ of the materials I listened to at the beginning of the exam __________ easy.