Используйте Present Perfect или Past Simple в следующих предложениях.1. America (to become) a leading world power.2. We (not/to choose) our future profession yet.3. He (to lose) his documents 2 days ago.4. I (to forget) your telephone number. Can you give it to me again?

she and her family live in london.

потому что это множественное число. они живут в лондоне.

стартовать значить наать;

1) мы знаем, что он работает над проблемами в области космической связи.(его работа связана с проблемами).

2) если вы сделаете даже малейшую ошибку в компьютерном языке, разговор ломается и вы должны идти в начало.( наверное, имеется ввиду, ошибка в алгоритме, программа рушится и надо начинать сначала? )

3) читальный зал библиотеки конгресса - это огромная коллекция справочников.

people all over the world are fond of sport. sport activities are very important for the growing organism of a child. children showed not neglect this fact.

there are many sport clubs that they can join us. light athletics gives much opportunity to those who go in for it. it includes track field events: running, long-jumping, high jumping, discus throwing and others.

many children are fond of ball games: basketball, volleyball, football. they are so exiting. besides they are played all year round. children like to take part in the competitions to see who is the quickest, the strongest, who can jump best, who is the best swimmer or player. pupils in different classes hold competitions in different kinds of sport. many boys and girls show good results. all the competitions and games are very popular with the pupils. a lot of fans always come to watch them.

my favourite sport is basketball. basketball is a wonderful sport. it; s a good exercise too. it makes us strong and healthy.

to become a good sportsman you must train a lot. if you want to be good at something you have to work hard. practice makes perfect.