Решение:
- Nobody knows if Ben (will remember/remembers) the words.
- The doctor can't say when Bob (will feel/feels) better.
- Write to me when you (will arrive/arrive) in Bonn.
- I wonder if Helen (will put/puts) on her new dress tonight.
- I am sure mother (will meet/meets) me at the station.
Ответ: remembers, feels, arrive, puts, meets.