Combine these sentences using given word

Example: He does more exercise. He is putting on weight.(because)

=> He does more exercise because he is putting on weight

1. He stayed at home. He was sick. (because)

=>………………………………………………………………………………………………..

2. It was very cold. They went swimming. (but)

=>………………………………………………………………………………………………..

3. We can go camping. We can go for a picnic. (or)

=>………………………………………………………………………………………………..

4. He had a stomachache. He didn’t wash his hands. (so)

=>…………………………………………………………………………