Question

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1.The problem...by Russian scientists (1. has solved, 2. was solving, 3. has been solved)
2. If it... raining we will go for a walk ( 1/stops, 2. will stop, 3. stopped)
3. If I...free, I"ll go to the party (1.was, 2.have been, 3. am.)

Answer 1

1 has been solved  2. stops.3 am