Bài 1:

1. _____ the crowd
2. _____ total
3. _____ the phone
4.  _____ the floor
5.  _____ night
6. _____ the street
7. _____ the Internet
8. _____ Easter
9. _____ groups of five
10. _____ the bus
11. _____ October
12.  _____ 12 o’clock
13.  _____ winter
14.  ___ Easter Monday
15.  _____4th July, 1776
16.  _____ Christmas
17.  _____ Saturday
18.  _____the weekend
19. _____ my birthday
20.   _____the end of the week
21. điền on,in, at