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 заданиях.
1) had potatoes
2)play computer games)
3)I have a shower
4)we were reading book for a long time( together)
5)then i wash my teeth )
6) i went in my bed
7) at 10:00 i was sleeping
Pretend as long as it's not real.
<span>1. a amazed
2 b boring
3 a satisfied
4 b amusing
5 a frightened
6 b interesting
1 (enjoy)
2 (is studying)
3 (am playing)
4 (do you go out)
5 (trains)</span>
21. I … remember her address. Я не могу вспомнить ее алрес.
A) can’t
22. I was pushing the door with all might – but it … open! Я толкал двери со всей силы, но она не открывалась.
B) wouldn’t
23. He sees very poorly. He … wear glasses all the time. Он выглядит растроенным. Ему придется все время носить очки.
A) has to
24. The painting … be a masterpiece, but the colours are wonderful! Картина не может быть шедевром, но цвета замечательные.
B) may not
25. I will be worried, so you … phone me every evening. Я буду волноваться, поэтому ты должна звонить мне каждый вечер.
A) must
26. To save money you … take a sandwich to eat on the train.Чтобы съэкономить деньги, тебе бы лучше взять сандвичи в поезд.
C) should
27. We’re going to this performance! I … buy two tickets at a very ridiculous price! Мы пойдем на этот спектакль! Я достал билеты просто по смешной цене.
B) was able to
28. It’s Sunday tomorrow and we … to go to school. Завтра воскресенье и нам не придется идти в школу.
C) don’t have
29. You’ve broken my cup. You … it! Ты разбил мою чашку! Тебе не за чем было брать ее!
C) needn’t have taken
30. It’s impossible! He … have taken the money! Это невозможно! Он не мог взять деньги!
B) can’t