a. Nếu nhiệt độ hai cốc nước khác nhau thì thuốc tím ở cốc nước có nhiệt độ cao hơn sẽ lan ra nhanh hơn vì cốc nước có nhiệt độ cao hơn thì có năng lượng nhiệt lớn hơn các phân tử nước sẽ chuyển động nhanh hơn.

b. Nội năng của đá vĩnh cửu tăng lên còn nội năng của nước trong cốc giảm đi.

Vì khi thả đá vĩnh cửu vào cốc nước ở nhiệt độ phòng thì sẽ có sự truyền nhiệt từ cốc nước sang đá vĩnh cửu (do cốc nước có nhiệt độ cao hơn đá vĩnh cửu), làm cốc nước giảm nhiệt độ khiến các phân tử nước chuyển động chậm lại còn đá vĩnh cửu tăng nhiệt độ khiến các phân tử, nguyên tử của nó chuyển động nhanh hơn.

1. How long do you spend playing video games on weekends?

2. Whose family owns the largest field for planting crops in the rural area?

1. I enjoy going to the park for a picnic, for it allows me to relax in nature.
2. We should go to this village in order that we can explore traditional ways of life.
3. If we throw trash on the ground, the environment will get dirty.

1. In some cities, there are some many cars, and this causes air pollution.

2. She's crazy about taking photographys of beautiful landscapes and scenery.

3. The river water is dirty enough to pose a threatre to aquatic life.

1. Avoid touchinghot surfaces as they can burn you.

2. Are bicycles a popular mode of transport in the countryside?

One of hobbies is gardening. I love to grow flowers and vegetables in the garden. In the spring, I plant seeds in the soil. I water the plants every day. Watching them grow is very exciting! I have colorful flowers like roses and sunflowers. I also grow tomatoes and peppers. Gardening makes me happy and relaxes me. I enjoy spendind time outside and breathing fresh air. It is nice to see my plants grow healthy. Garden is a fun and rewarding hobby!

1. I never play extreme sports without wearing a helmet.

2. We had a little food left from the market, so we made a nice dinner last night.

1. He is keen on taking photos of beautiful views while climbing.

2. We get into the habit of collecting eggs from the chicken coop every day.

3. The festival is not close enough to walk there in just a few minutes.

We are delighted to announce the 2023 Countryside Harvest Festival, which will be held in Greenfields Park from September 15th to September 17th, starting from 10 a.m. to 6 p.m.

Join us and celebrate the 2023 Countryside Harvest Festival this coming weekend. This event is open to everyone and admission is free. There will be a wide range of activities and delicious local cuisine to indulge in.

Visit the main stage at Countryside Square and participate in lively folk dances. Engage in exciting games and contests organized by the Countryside Community Center. Don't miss the captivating live performances by talented local musicians. Experience the joy of traditional countryside activities like pumpkin carving and hayrides.

Bring your loved ones and enjoy a day filled with fun and laughter. Don't forget to explore the farmers' market where you can find fresh produce and homemade goodies. We look forward to seeing you at the 2023 Countryside Harvest Festival!

1. My favourite hoppy is play basketball and ride cycling.

2. I start it when I have my free time.

3. I do it with my friends and my family.

4. I do it on Saturday and Sunday.

5. I think it so very exciting and wonderfull.