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Это не точно,но надеюсь на правильность ответа
Maslenitsa is an Eastern Slavic religious and folk holiday, celebrated during the last week before Great Lent, that is, the eighth week before Eastern Orthodox Pascha (Easter). Maslenitsa corresponds to the Western Christian Carnival, except that Orthodox Lent begins on a Monday instead of a Wednesday, and the Orthodox date of Easter can differ greatly from the Western Christian date.
Past simple это прошедшее время
Present Perfect это настоящее время
1. At this time tomorrow, John will be lying on the beach.
2. Peter will help you when he will finish his dinner.
3. Will you do the shopping for me, please?
4. Sarah will finish decorating the Christmas tree to midnight.
5. Where will you spend your holidays this summer?
6. I turned on the heating. It's cold here.
7. The film started at half past six.
8. Stop that noise or I will take your toy away.
9. Moira can type these reports as soon as she come back from her lunch break.
10. Perhaps the Jacksons will visit us tonight.
11. By the end of the year, Mrs Evans will have been teaching for thirty years.
В 12 предложении на мой взгляд все правильно. 4 предложение я бы тоже оставила как есть. В общем вот, но 100% уверенности у меня нет.
<span>Children go to school which are twinned with<span> schools in other countries.
</span>They swap work projects with one another.
They make pen-friends who they communicate with by e-mail.
They learn a lot of interesting things about their lifestyles, cultures and religions.
Children go to international schools.
Every day they mix with children who have different religions, cultures and lifestyles.
Children take part in </span>cross-cultural<span> projects.
They communicate with one another </span>by sharing <span>different stories and experiences.
They also take part in different </span><span>activities. </span><span> .
Any cross-cultural communication helps children from different counries:
to know what life is like in different countries;
to learn<span> more about other cultures; </span></span>lifestyles and traditions; <span>
to understand how big the world is and how many people live on the<span> planet we call home; </span>to understand that </span>we are all different and at the same time we are much alike.