—Excuse me. You mustn’t use mobile phones. Please look at the sign _______. —Oh, I’ m sorry! I didn’t see it.
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.
The question is _________ .
-- Must I return the book this week? -- No, you ______. You can _____ it for 20 days.
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