(     )1. My mother isn't at home and she has been to the post office.
(     )2. Listen!The noise is becoming loud and loud.
(     )3. I didn't go to school because my illness.
(     )4. They are swimming at this time yesterday.
(     )5. You should read as much books as possible in your free time.
(     )6. It's still one of the most beautiful sight in the world.