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1) The Managing Direcor didn’t tell us about the change of his plans
Did the Managing Director tell us about the change of his plans?
2) My boss didn’t phone me yesterday
Did my boss phone me yesterday?
3) We were not on a business trip last month.
Did we be on a business trip last month?
4) They haven’t just discussed the terms of the contract.
Have they just discussed the terms of the contract?
5) The secretary hasn’t sent the documents by air mail.
Has the secretary sent the documents by air mail?
6) In June we won’t produce two new models.
Will we produce two new models in June?
7) They won’t accept our offer.
Will they accept our offer?
8) The hotel wasn’t very expensive.
Was the hotel very expensive?
9) They didn’t have a meeting the day before yesterday.
Did the have a meeting the day before yesterday?
10) The plan for Moscow didn’t leave on time.
Did the plan for Moscow leave on time?

In my opinion sport is important for spending your free time in a healthy way. 
Sport also makes people stronger and happier. 

There are some popular kinds of sports in our country, such as volleyball, hockey, gymnastics, skiing, skating, and athletics. 
Everybody can try out a sport that he or she is interesting in. 

My favourite sport is snowboarding. Snowboarding is an extreme sport that is about going down snow covered slops and mountains. I went down many snowy mountains in the city boundaries of Yekaterinburg. I'm going to visit other cities soon too! 

Исправила ошибки и написала так чтобы звучала более natural. 
Если вы хотите чтобы я что-то исправили или объяснила - пишите : )