Сделать нужно нужно открыть скобки в нужном времени. 1. i (to be) here too long. i (to want) to get away. 2.what he (to do) for a living? - he ( to sing) and (to play) the guitar. 3. they (to leave) a week ago. 4.a shall tell you secret it you (to promise) not to tell anyone. 5.bart and his mother (to come) to dinner tonight. 6. tom's father (to teach)him to drive when he (to be 7.i'm afraid i (not to understand) you gerald. буду если вы !

1have been-want 2 what does he do-sings,plays 3 left 4 promise 5 are coming 6 will teach -is 7 don’t understand

1)  during this period the track structure has been substantially improved. one of the greatest improvements was the elimination of rail joints. in order to reduce the number of joints the rails are welded into continuous lengths.these continuous or long welded rails have greater strength and provide a smoother running of trains at far greater speeds. 2) another improvement which has made it possible to increase speeds on railways is the use of concrete sleepers. thus in some countries , concrete sleepers have replaced wooden ones on heavily used main lines because of their advantages. concrete sleepers have a longer life and a far greater weight than those made of wood. the greater weight of concrete sleepers provides the greater stability of track. it is this factor which has greatly contributed to increased speeds. ответ взял прямо из текста. насколько я помню, так надо делать в подобных .

Ilove autumn vacation. they give a break in their studies. just a pity that they are so short. autumn holidays only last week, sometimes ten days. do not have time to really relax, as the time has come to school. but quickly wean get up early in the morning. and then in the morning barely crawl out of the bed. i usually spend my autumn vacation home. the weather is already cold and rainy, so the street is not particularly a walk. at home, i read the book, or rummage in the internet. if the sun peeps, i go out into the yard. in the evenings we play with dad at checkers, backgammon and other board games.i love autumn vacation я люблю осенние каникулы. они передышку в учебе. только жаль, что они такие короткие.осенние каникулы только за прошлую неделю, иногда десять дней. не успели толком отдохнуть, как уже пора в школу. но быстро отучить вставать рано утром. и потом утром еле выползаю из кровати.обычно я провожу осенние каникулы дома. погода уже холодная и дождливая, поэтому на улице особо не погулять. дома я читаю книги, или роюсь в интернете. если выглядывает солнце, я выхожу во двор. по вечерам мы играем с папой в шашки, нарды и другие настольные игры.я люблю осенние каникулы