1st - first
2nd - second
3rd - third
4th - fourth
5th - fifth
11th - eleventh
12th - twelfth
15th - fifteenth
20th - twentieth
21st - twenty-first
<span>1. Do you regret not going to university? (not go)
2. You should stop having a rest before you fall asleep at the wheel. (have)
3. Stop shouting and talk to me calmly! (shout)
</span>
<u>Объяснение:</u>
"To regret doing something". Вместо "doing" поставить соответствующий глагол с окончанием -ing. То же самое и со "to stop doing something".
5)
У вас был текст к заданию? Потому что я так ответить не смогу без текста!
6)
Living with dangerous animals
1. The door is opened by them every day.
2. The story was written by me last Friday.
3. Computers games are played by many teenagers.
Our team wants to help the environment.
We fight against water and air pollution
Are you unhappy with the ecological situation in your region?
<span>Send us some information about it and we`ll try to help </span>