Put the Verbs in the brackets in the correct forms

9. This problem (to solve) in the near future.
10. The phenomenon of radioactivity (to use) widely in industry, medicine and agriculture
11. He found that this effect (to cause) by some unknown subatomic particles.
12. The weights of these particles (to calculate) with the help of electronic computer.
13. U-238 (to convert) into plutonium and then (to use) to generate atomic power.
14. These substances (to refer to) usually as hydrogen isotopes
15. One of the isotopes of hydrogen (to call) deuterium.
16. He (to puzzle) by these unexpected results.
17. It (to show) that these substances differed greatly in their chemical properties.
18. It (to expect) that the results of our research (to apply) in chemical industry.

I like going to school and I have some favourite subjects. But my most favourite is Maths. Some people won't understand it as they can say that Maths is boring. No, it isn't.
First of all I'd like to mention that I'm the best in my class in Maths. I like to solve puzzles on the movement, to find instant answers to offer teacher examples.In mathematics everything follows logic. Crucial always gets a specific result. In the world are the same formulas and mathematical laws. This item is a must in life.On the market and in the store you have to think fast, plan the family budget is also helpful.Mathematics is the basis of physics, algebra, chemistry and even some sections of geography.Mathematics play checkers and chess. Of them to be great military strategists. I urge all to understand the laws of this remarkable science . It is necessary for all.

1 Frank explained Diana that he didn't like ballet.
2.Paul told Harry that he didn't often go to the theatre.
3.Moria told David that she was fond of musicals.
4.Steve told Robert that they preferred seats in the stalls.
5.Victor told Rose that his parents often went to the Bolshoi.
6.Barbara asked if Alice knew about the new performance.
7.Greace wondered if I had seen the ballet.
8.Betty wondered if he had finished the play.
9.Brian asked me if Shakespeare had really written 37 plays.
10.Kevin said that they had enjoyed the concert very much.