Complete the given passage with an appropriate form of the verb. Choose your answers from the given options.

What ……………………… (do / does / did) aliens watch on television? Whatever it be, broadcasting ………………………. (require / requires / required) the transmission of radio signals. Astronomers in Hat Creek, California …………………… (is / are / have) working on a giant new array of radio telescopes that they say ………………………. (will / can) be able to capture the radio signals ……………………….. (transmitting / transmitted / are transmitted) by aliens if anyone out there is busy broadcasting.

When the Allen Telescope Array as it ……………………….. (knows / known / is known) is complete, it will consist of 350 antennas, each 320 feet in diameter. Using the separate antennas as if they ……………………. (are / were / have been) one giant dish, radio astronomers will be able to map vast swaths of the sky cheaply and efficiently.

The telescope ………………………. (helps / will help / would help) search for new phenomena like black holes eating others and so-called dark galaxies without stars. It will also extend the search for extraterrestrial radio signals likely to be …………………………. (broadcast / broadcasting / broadcasted) by aliens. The full Allen array will be able to detect a signal from as far as 500 light years.

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