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