1. Hung's hobby / collect stamps
Hung's hobby is collect stamps
2. He / start / collect stamps / when he was 10。
He started collecting stamps when he was 10 years old.
3. Hung often / buy stamps from / post office and / receive stamps / from friends。
Hung often buys stamps from the post office and receives stamps from his friends。
4. He / think / collecting stamps / interesting。
He thinks that collecting stamps is interesting.
5. Hung / say / he / collect more stamps / in the future
He says that he would collect more stamps in the future.