Insert the required tense (Passive Voice).

1. She read the current research journals, trying to understand the implications of the experiments which __ throughout the world, (to perform)
2. John, order a taxi at once. Henry __ suddenly to town, (to call back)
3. She noticed that he __ by two suspicious men from the coffee (to watch)
4. He examined some details of his case, and did not speak again until the beer __ and he had paid for it. (to bring)
5. He went up to his apartment. Nothing in it __ since his departure, (to change)
6. You can feel when you __. (to watch)
7. The oldest of London's theatres ( Theatre Royal, Drury Lane, which __ in 1663 and __ since __ several times, (to open, to reconstruct)
8. But what will I do if you __ ? (to kill)
9. Harry waited, before he spoke again, until the tea __ and the door __ (to bring, to close)
10. After breakfast, we heard that Mark __ for (to send)
11. The Nobel Prize __ to him in 1924 when the advent of wave mechanics had revealed the importance of his work, ten years after his famous experiment __ (to give, to perform)
12. I __ always __ in the street. It gives an amusement to my boring walk, (to follow)
13. The airport __ at all at that time, (to use — negitive)