11. China has the largest population in the world.  There are not …………………………………….. 12. The book really interests me.  I am ……………………………………… 13. They didn’t go fishing because it was too cold.  If it ……………………………………………. 14. When did you start learning English ?  How long _______________________________________________________________ 15. I’m sorry I was so rude to you yesterday.  I apologize ______________________________________________________________ 16. People say she is an honest and reliable person.  It is ___________________________________________________________________ 17. It took me two hours to do my homework.  I ______________________________________________________________________ 18. He left school and then joined the army.  After he ________________________________________________________________ 19. What is your date of birth ?  When __________________________________________________________________ 20. When Minh was small, he usually slept with his brother.  Minh used ______________________________________________________________