`\text{Exercise 4:}`
`\text{1. Although the car is very cheap, we still cannot afford it.}`
`\text{2. Betty can run fast though she isn't very tall.}`
`\text{3. Even though he doesn't have much money, he wants to buy a new car.}`
`\text{4. Although he's a hard worker, he can never save up enough for a house.}`
`\text{5. I still dislike it though there was a lot of food at the party.}`
`\text{6. They were well-educated, but they were boring.}`
`\text{7. He didn't tell me why he'd been late; however, I knew it.}`
`\text{8. She still had many friends even though she was unattractive.}`
`\text{9. They had lived in London for years, but they always spoke German.}`
`\text{10. She is a girl; however, she plays football as skillfully as any boys.}`
`\text{Xin hay nhất cho nhóm được khum ạ :)}`