7A Unit 4 Hobbies一、重点词组: used to do,billions of, see sb. do/doing sth, from one...to another,notA but B, as well as, all over the world, take photographs, for example, in the past, make friends, get excited, at the beginning of,grow up,in a second, take part in, think of, in a second二、重点句型:when I was young, I did not use to have much money..