A study has found that 80% of the people who ______ to be constantly distracted ______ more “working memory”.

They _________ got any brothers or sisters.

There ____ a terrible accident then, ____ three passengers were killed and twenty were injured as well.

To get as much first hand information as possible，inspectors will hold workshops and distribute questionnaires，       .

 — Each of the students, working hard at their lessons, ______the book.  — So have I.