9 ... any lessons on Saturday in schools in the USA

10... any students in classrooms at recess

11 ... any milk in the canteen now

12 ... tallest student in his class

13... in the world is larger than this one

14...in my school is more beautiful than my teacher

15 ... the highest in Hanoi

16 ... thirty- minute break

17 ... five forty five-minute classes every day

18 ... a three-month summer vacation

19 ... have a two-hour meeting

20 ... him 30 minutes to speak English with his friends

21 2 hours to do their homework

22 an our each day practising English

23 her an hour each day to do her homework

24 30 minutes today helping her mother cooking dinner

25 over 5000 employees in the United State's library of congress

26 3000 students in my school

27 ...lots of kind of food in the canteen

28 to school on foot

29 to the local library on foot every Sunday

30 starts at 1.45