阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。
Li Hua: Hi, Li Lei. Long time no see. What did you do during your winter holiday?
Li Lei: Hi, Li Hua. I found a part-time job in a real estate (房地产) company as    salesman for twenty days.
Li Hua: Really? That must be    (extreme) interesting.
Li Lei: Yes, interesting  tiring. I stood for ten hours a day and introduced the houses to customers that I met. Sometimes I was laughed at, but most of the time, I    (praise) for my wonderful work by many people.
Li Hua: I guess you  have gained a lot from this part-time job.
Li Lei: Yes, I really have learnt a lot about how to express my opinion, how to communicate    different people and how to work in a team.
Li Hua: I also took part in a great many social activities, some of    were really impressive. Through these activities, I not only gained a lot of social experience but also improved my practical skills, such as interpersonal skills and organizing ability. As far as I’m    , acquiring practical skills is of great    (important) to us students. Besides, the experience    (gain) may pave the way for our future career development.