one：

　　I had a good time last weekend. On Sunday morning, I stayed at home and did my homework. The homework wasn’t difficult. After that, I played volleyball with my friends. It was tired, but very exciting. In the afternoon, I cooked dinner for my grandparents. It was a little difficult, I think. After dinner, I went shopping. I could be very happy. I had a relaxing weekend.

　　two：

　　I am very happy today for I had the chance to help the old people in our subdistrict. Nowadays, many adults are busy with therir job and have no time to take good care of their old parents. I want to try my best to help the old come out of lonely life and now I can.

　　three：

　　It was the first day of our summer holiday. All of us were very happy. Why? Because we have one months to do things we love to do. We are free.Although we have some homework. But we can finish them in several days. And the rest time we can make good use of. My god! We have been very tired after hard studying. In winter holidays, I want to have full sleepand eat good food in order to replenish myself. Last but not the least, I will have a good rest.