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Do these sentences sound natural?

4 years ago
1. He seems just want to date her without marrying her, 2. I've been trying to address the problems, but they seem just getting worse and worse. 3. Credit cards never became mainstream in so many countries, and people prefer using cash instead of credit cards. 4. If you continue doing this everyday, I believe that you would get a hang of it very soon. 5. I have been sick over the past week, but I feel much better now after good sleep the last two days.