选词填空. hospital bookstore library post office traffic

2. If you want to send a post card or letter, you can go to the ______________.

3. We should obey (应该遵守) ______________.

4. If you have a cold ______________ (感冒), you can go to the ______________ to see a doctor.

5. If you want to read books and don't want to buy them, you can go to the ______________.