fill in after, at, before, in or on where necessary.

1. not all people do their christmas shopping before the holiday,
some prefer to take advantage of the sales that start christmas.
easter sunday many people go to church. 3. it's traditional
for children to dress up halloween. 4. when is easter marked
this year? 5. halloween is celebrated the eve of a major
catholic festival, all saints. 6. easter sunday morning children hunt
for eggs and candy. 7. late the evening or night young people
went to the woods to look for a fern flower. 8. chocolate eggs are given to
children easter. 9. in italy people have picnics in the countryside
easter monday. 10. palm sunday falls the last sunday
easter. 11. usually there are 8 bank holidays a year in england.12. the white house easter egg roll started_ 7.30_ the morning.
13. people say that the night of july 6-7 animals and trees could
talk to each other. 14. in the uk the christmas shopping season usually
starts november. 15. christmas will be here a few days.
16. on april fool's day practical jokes aren't played midday.​

He writes that he is coming to Moscow.

I know that they are at home.

When I was in Kiev, I met Petrov.

We know (that) they're doing well.

I know they are here.

When I was a student, I lived in Kiev.

Please wait for him , here till he comes back.

Please stay here until I return.

As soon as he saw us, he came towards

Please give me this book to read after you have finished it

While I'm writing this, you can read a newspaper.

You should see the doctor before you go back to work.

Can I have this book to read if it's interesting?

I couldn't go to the Institute yesterday because I was ill.

As my lessons begin at half past eight, I have to get up at seven in the morning.

My friend works hard at his English, as he wants to speak the language well.

Environmental problems have become one of the most urgent problems of modern society. More and more people suffer from air and water pollution. Nature also suffers from land and nuclear pollution. The reasons for such environmental problems are numerous. Among them increasing number of cars in the streets, factory waste, millions of cut down trees, destroyed habitats of animals, contaminated rivers and seas. All these problems mainly arise due to human careless activities and gradually destroy our planet. If we look closely, we’ll notice that not only one city is under danger, but the majority of world population. Fortunately, there are many ways to suspend these problems. If everybody starts caring about the planet we live on, many environmental problems can be solved. For example, if we start recycling paper and cardboard, we can save lots of trees. If we start using public transport more than private cars, we can have less air pollution. Local governments can also help to prevent some problems, if they forbid logging companies to destroy the forests, or stop factories from polluting water. The most important thing is, of course, to start acting immediately, otherwise we might have to face many global disasters.