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35. Do you know who _____________ the fact that sound travels in waves?
36. I'm thinking of getting a fax _____________.
37. The _____________ of the outbreak of the disease is still unknown.
38. Ten million text messages are sent on _____________ every minute.
39. Once they've finished the extension to the _____________‚there'll be room for them to take on a lot more workers.
40. Shannen doesn't dye her hair; it's _____________ blonde.
41. I’ve _____________ it in at the mains but it still doesn’t seem to work.
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