Помогите решить тест!! СРОЧНОО!1)About 22 000 nuclear weapons__ in our world

Помогите решить тест!! СРОЧНОО!
1)About 22 000 nuclear weapons__ in our world today a) remain b) remained c) will remain d) to remain
2)Nuclear weapon states__ over 2,000 nuclear tests to date a) conducted b) have conducted c) conduct d will conduct in the Netherlands.
3) Next year the summit __a) will take place b) took place c are taking place d) ake place
IV. Find and correct the mistakes.
1. What you discussing?
2. Why nuclear weapons are the most dangerous weapons on earth?
3. How many states do have nuclear weapons?
4. When did the World War 2 began?