... cause D treat Question 28 In this case, I think nothing A it is better to say B it be better to say C better to say D better for saying Question 29 Mark, I don't think you Carol, the new department ... Scientists call this a mass extinction Scientists think there (45) _ at least five mass extinctions in Earth’s history The last mass extinction happened about 65 million years ago This mass extinction ... for this computer? → How much does Question The last time Joe heard from his family was in June → Joe hasn’t Question How long have you been living in this new house? → When Question This...