прямые a b и c имеют общую точку. верно ли, что данные прямые лежат в одной плоскости? ответ обоснуйте.

Имеет ли корни многочлен: x^2+1 и х^3-27 С решением пожалуйста;)

Use to where necessary to complete the sentences. Надо вместо точек где то вставить to, а где то не надо. 

1. Have you ever seen fish ... jump? 2. How can you make a child ... learn to be polite? 3. We all want you ... be very happy. 4. Yesterday I heard someone ... say that the weayher was going to change. 5.I will let you... go to the cinema if you are good. 6.Sara did not expect her mother... give her a pet as a birthday present. 7. I did not notice him .. leave the room. 8. The chidren were made ... learn a long poem by heart. 9. In the dark the boy felе his father ... take him by the hand. 10. Margo would like her teacher not ... be so strict.