Mr. Black’s car is broken. So he has to go ____ his bike to school.
--Who _______ the Harry Potter series________ ? -- J.K.Rowling.
We know that about seventy percent _____ the earth _____ covered by water.
The question is _________ .
-- Must I return the book this week?-- No, you ______. You can _____ it for 20 days.
– You shouldn’t stay up late tonight.–Thanks, I will go to bed earlier. .