Rewrite sentences in the passive with full verb forms. Pay attention to the use of modal verbs in passive structures. (Перепиши предложения в пассивном залоге. Обрати внимание на употребление модальных глаголов в пассивных конструкциях.)

Образец:
Children may take their toys to the class.
Children’s toys
to the class.

1. You cannot study a foreign language in a couple of months.
A foreign language
in a couple of months.

2. Parents must keep medicine in a safe place.
Medicine
by parents in a safe place.

3. George’s neighbours might scratch his car last night.
George’s car
by his neighbours last night.

4. Pupils had to bring their books to school.
Pupils’ books
to school.

если несложно, поставь мне "лучшее решение", кликнув по нему.

1)i`m quite certain that global warming is unavoidable. 2)the most difficult thing in the world must be all the attempts to develop heavy industry and move it ahead without causing damages to the nature. 3) however, the humankind, and scientists particularly, will overcome such bumps on their way, there is no doubt about it. ) i have always had a feeling that human is the most dangerous animal on earth. 5) in turn, damaging of natural world must be quite easy. 6) a peasant never crosses himself before it begins to thunder which means that people won't understand the real harmful impacts of their actions until they've got the awful responses from the nature, and i know i`m right. 7) discovery of new panacea or gigantic sources of alternative energy, i mean harmless energy as well, might be a wonderful thing to do.

получился более менее связанный по смыслу текст.

в холодный день в 1942 году в нацистском концлагере, одиноким, мальчик выглядит колючей проволокой и видит молодую девушку, проходящих мимо. она также замечает его. в стремлении выразить свои чувства, она бросает красное яблоко через забор-признак жизни, надежды и любви. молодой мальчик изгибы более, берет яблоко. выражение радости касается глаз, луч света появляется в темноте. на следующий день, думая, что он является сумасшедшим даже мечтал увидеть эту девушку снова, он выходит за пределы ограды, надеясь. с другой стороны колючей проволоки, молодая девушка с нетерпением ждет встречи снова трагическая фигура, который переехал ее так много. она приходит снова с яблоком в руке. несмотря на холодных ветров зимой и охлаждения воздуха, два сердца утеплены и мальчик получает яблоко снова. сцена повторяется в течение нескольких дней. два молодых духов по разные стороны забора с нетерпением ждем встречи друг с другом, лишь на мгновение и просто обменяться несколькими словами. на последнем из этих мгновенной встречи, мальчик его ласковый друг, нахмурившись, говорит: "завтра не приносят мне яблоко, я не буду здесь. они посылают меня в другой лагерь ". мальчик уходит, слишком убита горем, чтобы оглянуться назад. 

i like when the weather is hot enough. i don't like too hot weather. i like hot weather, because that's relly nice. sky is blue, sun is shining there. i like to walk with friends and enjoy hot weather. i always play football or basketball. sometimes i go to the park with  my best friend. we like to walk near lake and to listen bird's beautiful songs and to talk about many things. but i hate rane and cold weather. that time i can't have a nice time with friends.

i think summer is the best season for rest because it is warm, the nature is beautiful and we have great opportunities for rest. summer is a time of holidays. we can go for a walk all day long, watch the clouds, swim, sit down by a river or a lake on fresh, green grass,

climb high hills, play different games, ride a bicycle and so on.

i spend my summer holidays at my granny. there were many things there to enjoy. i swam in the sea, lay in the sun and did many other things. sometimes i made a fire with my friends at the seaside and cooked potatoes there. it was wonderful. we told anecdotes to

each other, and did everything we wanted. i also got used to walk alone in the forest.

when the august was coming to the end, i went on a small voyage by ship.

but the last summer wasn't for me only sugar and honey. i have passed through the graduating exams in school and entering exams in the university and technical university. so the bigger part of my summer vocations i spent at the books. of course, it was not

interesting, but i'm glad that i did it because now i'm a student of the best university in primorye and the whole far-east.