Grammar

Put the verbs in brackets in the correct form (use Past Perfect or Past Simple Tense). HELP
a)
The opening of the first transatlantic commercial service between Glace Bay and Ireland (take place) after the first shorter-distance public service of wireless telegraphy (be established) between Italy and Montenegro.
b)
The military (understand) the usefulness of remote-controlled vehicles after Tesla’s patents (expire) .
c)
He (give) a practical demonstration of the principles of radar, the coming of which he first (foretell) in New York in 1922.
d)
It was widely discussed that Nikola Tesla (refuse) the Nobel Prize because Marconi (already receive) his.
e)
He (leave) behind him a world that even before his death (come) to regard radio as a commodity, not a miracle.
f)
In 1877 Edison (make) a recording on a little machine which he (invent) .