Составить притяжательную форму существительного: 1.the walls of the room 2.the days of the week 3.the birthday of my daughter helen 4.the pages of the book 5.work of seven years 6.the surface of the earth 7.the orders of the commander-in-chief

The room's walls
the week's days
my daughter Helen's birthday
the book's pages
seven years' work
the Earth's surface
Commander-in-Chief's orders

3. My daughter Helen's birthday
5. Seven years' work
6. Earth's surface
7. The Commander-in-Chief's orders

В остальных случаях образование притяжательной формы с апострофа невозможно, т.к. это неодушевленные существительные. Исключения: фразы со значением расстояния, времени; слова planet, Earth; названия стран и городов и др.

Motorcycle. What do you feel when you hear that word? What are the first associations come to your mind? Speed. Adrenaline. Drive.Freedom. Danger. 
What are the advantages of this form of transport. 
 For the motorcycle does not exist limitation, traffic police, traffic jams and many other problems on the road.  It is easier to maintain than any car.  It enhances the thrill.
Disadvantages.
Everything would be fine, but the driver and passenger insecurity on the weather conditions (special clothing) and the instability of the motion on the snow and ice cover the roads spoil his reputation. Therefore, it is inconvenient in bad weather.In addition, the motorcycle may be not only elegant, but also the most dangerous. The chances of surviving an accident at the motorcyclist is extremely small. Death comes instantly. Maimed - it is also not the best option. Therefore, in any extreme sports, and even on the road you need to know the measure of speed and emotion. After all, sometimes life does not forgive mistakes 

Technology has changed our life. We can learn online thanks to modern technology. Let us consider advantages and disadvantages of e-learning.
On the one hand, you don't have to go anywhere and it saves your time. You can see lectures and study lessons as much time as you need until you understand.
On the other hand, some people can become fat and lazy because they spend too much time at home. You will communicate less and will probably become lonely.
To sum up, lesson will be more interesting and people will have more spare time. But e-learning will lead to less communication.