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.

I used to have a dog when I was a child
He used to be noisy when he was young
She used to go to the country when she was 7
I used to walk many years ago
They used to drive fast when he was 20
Did you use to have a dog?
Did she use to go to the country?
Did he use to drive fast/
Did they use to walk 5 years ago?
Did you use to play tennis 5 years ago?
I didn't use to walk when I was 5
He didn't use to drive when he was 18
She didn't use to go to the country when she was 7
My mother didn't use to play tennis when she was a pupil
He didn/t use to have a dog

donation - money, food, or other help to people who have been affected by situations such as wars or floods.

campaign - actions intended to produce change.

charity - an organization that helps people who are poor or ill, or who need advice and support.

aid  - the act of giving money or goods to an organization.

foundation - an organization that provides money for medical research or for a charity.

fundraising - the activity of trying to persuade people or organizations to give money for a specific purpose (especially for a charity).

non-profit - (not-for-profit) organization exists in order to help people and provide a service, rather than to make money.

philanthropy - the belief that you should help people, especially by giving money to those who need it.

sponsorship - money given to an organization to help to pay for something, often an event.