Put the words in order to make sentences in the passive. 1 designed / was / Who/by/ the / invention/? 2 of / Billions / be / space / will / on / dollars / exploration / spent /. 3 made/many / those / How / were / of /watches/? 4 engineers / manuals / The / have / written / been / by/. 5 are/ Which / apps / in / language / written / programming/? 6 product/discontinued / the / Why / be / will/?