Нужна , только b​, только по сверху

-tion: motion, action, emotion, traction, absolution, motivation, nation, function
-sion: invasion, illusion, confusion, intermission, division, obsession, inversion, remission
-er: painter, acer, boxer, peer, joker, fever, risen, power
-or: amor, factor, raptor, terror, senior, violator, operator, predator
-ment: lament, document, monument, movement, pavement, alignment, torment, sacrament
-ity: city, unity, purity, clarity, dignity, gravity, quality, mobility.
-ist: gist, assist, egoist, resist, sadist, atheist, coexist, monotheist
-ance: chance, balance, advance, bromance, defiance, substance, vengeance
-ence: science, silence, evidence, presence, innocence, insolence, reverence, enhance
-ing: king, ming, ping, ring, song, bring, ring, amazing

1. Railways are to be (future - мод) completely automated to increase high-speed transportation. 2. A lot of changes are (present - вспом) taking place in modern science and technology. 3. Mobile cranes have (present - осн) a great lifting capacity. 4. The old hump yard had to be (future in the past - мод) modernized. 5. Computеrs are (pres - вспом) used to automate the train movement.
1. Железным дорогам предстоит полная автоматизация, чтобы увеличить скорость транспортировки. 2. Много изменений происходит в современной науке и технике. 3. Мобильные краны имеют большой  подъемную силу. 4. Старой сортировочной горке предстояла   модернизация. 5. Компьютеры используются для автоматизации движения поездов.