a bicycle, also known as a bike, pushbike or cycle, is a human-powered,pedal-driven, single-track vehicles, having two wheels attached to a frame, one behind the other. a person who rides a bicycle is called a cyclist, or bicyclist.
bicycles were introduced in the 19th century and now number about one billion worldwide, twice as many as automobiles. they are the principal means of transportation in many regions. they also provide a popular form of recreation, and have been adapted for such uses as children's toys, adult fitness, military and police applications, courier services and bicycle racing.
a great power is a country that has the ability to exert its influence on a global scale. goverment of this country has economic capability, political stability and military strength. today we can see a multinational forums like the european union and the group of eight. countries of g8 have heavy responsibility for whole world because of their nuclear weapons and large economies.the top of major powers in the world are expected to resolve tensions around the world and promote peace. i think everyone have to know: significant powers have existed throughout history, it is important part of our life, with big powers we can work out solutions to global problems together
1)have you joined your friend's club? i haven't joined my friend's club yet but i'm going to do it.
2)have you seen those animals? i haven't seen the animals but i'm going to see them.
3)have they rebuilt the left wing of their house? they haven't rebuilt the left wing of their house but they are going to do it.
4)has she been to see the vet with her pet? she hasn't been to see the vet with her pet becouse the vet was ill.
5)have you arranged the party? i haven't arranged the party yet but i'm going to do that.
6)has she invited the scientists to the conference? she hasn't invited the scientists to the conference but she is going to do that.