Bài 4: Nối hai câu đơn sau thành câu ghép. 1. My best friend is studying abroad. It is impossible for us to meet each other now. 2. They are going to build a new bridge across this rive. Traveling will be much more convenient. 3. It has been ages since our last encounter. I still remember him clearly. 4. I went down with flu last week. I had to postpone my work. 5. I think the festival will be full of fun. Many people will enjoy it. 6. Students can choose to carry out a project on environmental issues. They can conduct research on the topic of renewable energy. 7. My mother started a business trip last week. She hasn’t returned home yet. 8. My brother has grown up into an adult. He still enjoys playing with Lego.