Supply the correct passive form of the verbs in the blankets.

1. has been used 

Dấu hiệu nhận biết: "for two years" => thì Hiện tại hoàn thành.

2. was discovered

3. has been widened

"since 1999" => thì Hiện tại hoàn thành.

4. was finished

"in 1973" => thì Quá khứ đơn.

5. is situated

be situated : nằm ở.

6. was built

"many centuries ago" => thì Quá khứ đơn

7. visited

"last week" => thì Quá khứ đơn.

8. was completed

"in 1973" => thì Quá khứ đơn.

9. was formed

"in 1209" => thì Quá khứ đơn.

10. was opened

"in 2010" => thì Quá khứ đơn.

1, has been used

2,was discovered

3,has been widened

4,was finished

5,is situated

6,was built

7,visited (câu này có chắc là dạng bị động ko bn, mk nghĩ là câu chủ động)

8,was completed

9,was formed

10, was opened

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