1. Watching TV is not good because it hurts your eyes.
2. My little sister can only color a picture, but she can't draw.
3. He was tired last night, so he didn't go out with his friends.
4. Minh is hard-working and very intelligent.
5. Although the weather was very bad, the farmers had a good crop last year.

1. Watching TV is not good. It hurts your eyes. (because)
Watching TV is not good because it hurts your eyes.
2.My little sister can only colour a picture. She can't draw. (but)
My little sister can only color a picture, but she can't draw.
3.He was tired last night. He didn't go out with his friends. (so)
. He was tired last night, so he didn't go out with his friends.
4.Minh is hard-working. He is very intelligent. (and)
 Minh is hard-working and very intelligent.
5.The famers had a good crop last year. The weather was very bad. (although)
Although the weather was very bad, the farmers had a good crop last year.