Как надо знакомить 2-speaker в english debate? напишите , introduction и советы которые к победе? ! и если 1 speaker рассказал что хотел, а где роль второго спикера получается? что он должен делать? ответьте, на эти важные вопросы ! ?

Have been tested - Новые три вагона поезда-цистерны были испытаны в суровых зимних условия на ж/д в Аляске.
will have been completed - Строительство моста и дамбы будет закончено к началу сезона навигации.
are being constructed - В настоящее время в Европе и Азии строятся 2500 км скоростных линий.
maintains - система кондиционирования воздуха всегда поддерживает оптимальную температуру и влажность в вагоне.
is being built - В настоящее время новая высокоскоростная железнодорожная линия строится на севере России. 
has caused - Потоп значительно повредил железнодорожную ветку.

Some people think that it is necessary to change something in education to make it more useful and interesting. But others think it is unnecessary.
In my opinion, school trips can be very useful for education. Children spend more time in a fresh air; they will be healthier and energetic. Furthermore, different trips can make process of studying more exiting and more interesting. Pupils see everything with their own eyes. I think it is better to see, to touch and to feel than to read. Pupil will remember everything very well. However, some opponents say that school trips are real waste of time. This is not true, because pupils will have an opportunity to broaden their mind. Also some people suppose that a lot of parents will not let their children to go somewhere, because they think that it can be dangerous. I am sure that teachers will provide security and safety to children and there are no reasons for worries. To sum up, some people think that school trips are useless and dangerous but the vast majority would disagree. To my mind school outings can be very educational and pupils really enjoy it.