Things My Students Did Today During Class Instead of Working on Their Assignment

An assignment that they think must be completed in an unfairly short amount of time
  1. Sang along to to Christmas songs
  2. Complained about how their last essay was graded
  3. Complained about the regular teacher for the class
    I'm a long-term sub; the regular teacher graded their essay
  4. Complained about how busy they are
  5. Did some online shopping
  6. Gossiped
  7. Sent several text messages
  8. Snapchatted
    Is that the correct past-tense form??