--Mary, where’s Simon? I haven’t seen him for days.--He __________ Japan. This may be the third time he _________ there.
Students can’t be made ____________ all day.
You know great changes _____________ in our school in the past ten years.
Paul doesn’t know _________ about his problems.
--Who _______ the Harry Potter series________ ? -- J.K.Rowling.
We know that about seventy percent _____ the earth _____ covered by water.