MAINLAND people have a strong sense of patriotism and social responsibility and a mature way of thinking. This was the conclusion of four youngsters who recently returned from Beijing and Inner Mongolia after participating in an exchange camp during the summer holidays. The ''Hong Kong-Mainland Youth Summer Camp'' was jointly organised by the Hong Kong Federation of Youth Groups and the All China Youth Federation. A total of 30 Form 4 to 7 students were chosen from among hundreds of applicants to take part in the camp. One of the camp leaders, Ms Mishelle Yiu Yuk-yee, said: ''We are very happy the camp promoted understanding and friendship among the young people.'' She said the camp also gave Hong Kong students a better understanding of the lifestyle of youths in Beijing and Mongolia. The Hong Kong delegates, together with some 60 secondary school students from China, took part in various activities such as seminars, visits and meetings. Wallace Lo Kwok-wa, Fanny Lau Fung-yi, Selina Ting Yin-yin and Thomas Chung Ho-yin were touched by the warmth and affection of the mainland campers. They found the mainlanders very different from Hong Kong people. ''We admire the cultures of western countries; we rarely think of our homeland,'' Ho-yin said. ''But the mainland people are always thinking of their country.'' The 19-year-old added that even though the majority of the mainland campers were younger than the Hong Kong delegates, their thinking was more mature. Yin-yin was impressed by the strong sense of responsibility of the Chinese students. ''They all intend to contribute their skills and knowledge to the development of China.'' Meanwhile, Fung-yi, now a Year 1 student at the University of Hong Kong, appreciated the way mainland people spent their money. ''They will not use their money without careful consideration as the living standard is low and they do not have much to spend,'' she said. For Kwok-wa, patriotism was an outstanding trait among mainlanders. The sixth-former of Cheung Chuk Shan College said Hong Kong people should learn to respect their city. The students also met Director of Hong Kong and Macau Affairs Office Lu Ping in Beijing. The teenagers found him a friendly man. Asked whether they had any special thoughts about their Mongolian counterparts, the Hong Kong students said: ''The Mongolian campers were enthusiastic to make new friends.'' Ho-yin said apart from using Putonghua and body language, there was another interesting way to communicate with Mongolian youths: by singing. ''Music is a means of communication for them; we sang along with them and it was fun! It also gave us a taste of their culture.''