Complete the dialogue with the correct Present Perfect Simple or Continuous form of the verbs in brackets. I would be very grateful if you could help me.

When should you use encyclopedias such as wikipedia? a. never, it is not appropriate to use this source in college b. it can you get an overall understanding of the subject matter but is not considered a college-level source c. as long as wikipedia isn't the only source, it is always appropriate to use this source

Which of the following statements would most encourage productive conflict? select all that apply.

Which fits best in the empty box above?