Question

Место пробелов вставить (который? кто? что? когда? где? )
Which ,who ,that ,when,where .
1. 1843 was the year in ... Samuel Morse proposed a way to give every letter and number a special code (point ,line and space).
2. It was Morse's Symbol code ... we can still find used today .
3. Alexander Popov from Russia ... invention of the radio came before Marconi's, did non patent it.

Answer 1

1 ecли точно стоит in-тогда which ( лучше when)
2 which
3 whose

Answer 2

1.when
2.which
3.who
!!!!!!!!!!!!