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6. Complete the passive questions with the verbs in brackets.
1. How much of the earth’s surface (cover) by water?
2. you (invite) to the party last week?
3. the gallery (close) next Sunday?
4. When antibiotics (discover)?
5. How this word (pronounce)?
6. When this old castle (build)?
7. How many plastic bags (throw) away each year?
8. When her next book (write)?
9. What prize the winner (give) yesterday?
10. Why the letter (send) to the wrong address?