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Complete the sentences with the correct active or passive form of the verbs in brackets.
1.3D films _________________ (exist) since 1922, when The Power of Love was first shown.
2. Smoking __________________________ (not allow) on any planes in the EU.
3.The world’s first manned hot-air balloon _______________ (make) by the Montgolfier brothers in 1783.
4.Look out of the window! I think our house___________________________ (watch)!
5.By the time Sandra got to the party, all the food ________________________ (eat).
6.More than three million tourists _______________________ (visit) the Taj Mahal in 2004.