Обьясните написание союзов в тексте: a/an, the, - -

Saint Petersburg is also known as 1)THE 'Venice of the North' and there's no mystery why. With its many beautiful buildings built along its numerous canals, it surely is 2) A picturesque and majestic city. There are also more than 400 bridges crossing its canals thanks mainly to 3) AN urban project begun in 1703 under 4) - - Peter the Great.
5) A walking tour is 6) A great way to see 7) THE city's monuments. Start at 8) - - (petrogradskaya (metro gorkovskaya) and go across 9) - - Troitsky Bridge from where you'll get 10) A great view of the central part of 11) THE city including 12) THE Spit of Vasilyevsky Island, 13) - - Admiralty Tower, St. Isaac's Cathedral and Peter and Paul Fortress.
Cross the bridge and you'll find yourself in one of 14) THE most charming neighbourhoods you could imagine full of 15) - - museums, monuments, and architectural masterpieces. You shouldn't miss 16) THE Palace Square. It is one of 17) THE most grandiose square of the city with it’s 18) Winter Palace, the royal residence of all 19) THE Russian Emperors except 20) - - Paul. From here you should just wander around and you won't be short of surprises.​

to do a crossword 

a crossword is done

is a crosswod done?

a crossword is not done

to read a book

a book is read

is a book read?

is  the book written?  

a book is not read

to recite a poem

a poem is recited

is a poem recited?

если надо поменять время, то принцип тот же

представьте, что выпобывали в одномиз этих местпраздникинаписать письмовашим иностраннымо месте и, как выпотратили своевремя там.(письменно; 150-180слов)

birthday is a very wonderful day. everybody likes to celebrate it. it is a good opportunity to spend time with friends, parents, relatives.in the morning on my birthday my parents lay the presents near my bed. so the first thing i see when i open my eyes is my presents.

usually we hold my birthday party in the evening. once we went to a cafe to celebrate my birthday, but usually we celebrate it at home.in the morning of birthday party day my father goes shopping and buyes everything we need. my mother bakes a cake or pie.i am always very glad to meet my guests. i like to get flowers and presents.

we dance and sing songs, play games, tell funny stories.

i think that my birthday is one of the best days in a year.

1. she has one sister and two brother 

у нее есть сетра и 2 брата

2. he and i have many things in common 

он и я имеем много общего

3. they have a new car

у них есть новая машина

ставим has только в 3 лице ед.ч

1. there is a new moon tonight

сегодня вечером новолуние

2. there are a lot of english classes in our college

в нашем колледже много уроков языка

1. we always travel by car

мы всегда путешествуем на машине

2.the child plays in the park every afternoon

ребенок играет в парке каждый день