Open the brackets. (Раскрыть скобки излучатель) of the electrons. 2. The diode (проводит) current in one direction only. 3. All the triodes (to have) the following electrodes: a cathode, a plate and the third element (to call) (сетка). 4. The grid (управляет) the flow of electrons. 5. (Чем ближе) the grid to the cathode, (тем больше влияния) it (to have) on the electron flow. 6. Photovoltaic cells (to use) the light of the sun (для производства) electricity. 7. Sunlight (to be) a clean, renewable energy source. 8. In the nuclear fission reaction, a large amount of energy (to release). 9. Nuclear reactors (to use) for (генерирование) electricity, moving aircraft carriers and submarines. 10. The nuclear power industry (to improve) the safety and performance of reactors.

Are you leving party now?  Present continiuos
Do you love him? Present simple
Have you ( or have you got )  brothers or sisters? Present Simple
Who cooks dinner tonight а здесь допустимо и Present Simple, и Present Continiuos, англ язык, к сожалению, богат на такие двойственности Who is cooking dinner tonight?
Does he send you an e-mail every day? Проверьте свой текст если send, то так, как я указала выше. Если sent, то Did he send you an e-mail every day? На 4 предложении настаиваю на варианте Who is cooking dinner tonight?

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.