1. after he (write) a letter he (send) it to his parents.после after past perfect а остальное в past simple

1after he had written a letter he sent it to his parents.

Sportsmen have run marathons for more than a hundred years. in march 1981, the first london marathon started. 7,747 people competed in it.  people have run/have been running the london marathon since 1981. it is the distance from windsor castle to the while city stadium in london. it is 42,195 kilometres long. women didn’t run marathons till 1984. since the 1990s marathon running has been a very popular sport. people run marathons in their spare time. the record for the london marathon was 2 hours 8 minutes and 16 second in 1985. the london marathon is an international competition and street festival, all in one.

Why do young people spend much time on the social network? < br /> nowadays the social network is highly popular way of spending time for young people . i am a girl , aged 14 .as for me it is also an easy way to come in contact or to become friends with other people . i must not go somewhere to get a conversion or chat .i can just use the social network for it . it saves my time . do you know how much does it takes young lady to be ready for the date ? i know , i can tell .it usually takes me to be ready for the date one hour or so . it is always very difficult task to be ready on time. so the social network is my saviour. when i am in the social network there is no need to do my hair , to have make up , to put on gorgeous dress and heels .i can wear what i want .and of course when i go to a date with somebody i feel nervous myself but the social network helps us to feel more free and not to be shy in a conversion.