Future Perfect Simple and Future Perfect Continuous

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1. By the end of the year, he(become)_______________________a doctor.

By the end of the year, he'll (will) have become a doctor.

2. (Scientists / find)_______________________a solution to Aids by the end of 21st century?

Will scientists have found a solution to Aids by the end of 21st century?

3. John will be very tired tomorrow, he(work)_____________________________for more than 20 hours.

John will be very tired tomorrow, he'll (will) have been working for more than 20 hours.

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