Choose the correct modals/ 1.you shouldn't/needn't run if a grizzly bear approaches you. 2.takong up a new sport must/might be a good way for you to lose weight. 3.i mustn't/don't have to go to school tomorrow; it saturday. 4.you don't have to/mustn't drive while tired. 5.you must/might see a doctor immediately if a raccoon scratches you. что к чему объясните

1 shouldn't 2 might 3 don't have to 4 mustn't 5 must 

1. You shouldn't run if a grizzly bear approaches you (Ты не должен бежать, если серый медведь приближается к тебе). 
2. Taking up a new sport might be a good way for you yo lose weight. 
3. I don't have to go school tomorrow. It's Saturday.  (Мне не нужно идти завтра в школу. Это суббота). 
4. You mustn't drive while tired (Ты не должен ехать из-за усталости).
     Вариант 2: You don't have to drive while tired - Тебе не нужно ехать из-за усталости -  выглядит этот вариант довольно мягким уговором, лучше выбрать 1-ый вариант, более правильный, хотя он,назовем, более приказной.
5. You must see a doctor immediately if a raccoon scratches you (Ты должен немедленно осмотреться у доктора, если енот царапает тебя).

Какой из 2-х ответов выбрать?  И трудно, и спорно, выбирал по интуиции.

1. 17x-8=20x+7

17x-20x=7+8

-3x=15

x=5

2. х кг- младший,

3х кг-старший,

(х+13) кг -средний.

Всего- 88 кг яблок.

х+3х+х+13=88

5х=88-13

5х=75

х=75:5

х=15(кг)- яблок собрал младший брат.

3.   0,6(х+2)+4,6=0,4(7+х)

0,6x + 1,2+4=2,8+0,4x

     0,6x+5,2=2,8+0,4x

     0,6x-0,4x=2,8-5,2

             0,2x=-2,4

                  x=-12

4. Пусть х л воды было в каждой цистерне первоначально, тогда

(х-54) л воды стало в первой цистерне, а 

(х-6) л воды стало во второй цистерне.

Т.К. в первой стало в 4 раза меньше, чем во второй, то составим уравнение: 4(х-54)=х-6,  4х-216-х+6+0;  3х=210;  х=70

ответ: в цистернах было по 70л воды

5. (3x+42)(4.8-0.6x)=0

3x+42=0         4.8-0.6x=0

3x=-42             -0.6x=4.8

x=-14                 x=-8

Вроде все правильно..

1. When he entered the room, he saw Anna where he had left her. 2. I noticed when I entered,

that someone left their umbrella on the porch. 3. He did not read half the book, as he stated that

he doesn't like her. 4. When the guests left, she went into the living room and turned off the light. 5.

She sat on the sofa and wondered why her father's letter hadn't arrived yet. 6. Rain

it had stopped, but there was still a slight mist in the air. 7. I didn't know when he left. 8. He

I didn't remember his name, and I didn't remember ever having met him before. 9. We

we drove about two hours when we finally saw the lake. 10. It was some time before

than they realized that he had nothing to say. 11. when he Arrived home, he found out that his

my sister just left. 12. When the expedition returned, they said that they

seen in the Arctic.13. She had finished packing by the time her sister

she knocked on the door. 14. The last days were very cold, but the snow was not.15. When

everyone left, she went to the phone and quickly dialed the number. 16. When the parents

when they came back, I showed them what I had done. 17. my Mother tried to calm me down after

after you left. 18. I was surprised at the progress she made, given how little

it had been a long time since I'd seen her.19. he did Not have time to go to the

doors, how I met my school friends. 20. He again returned to Moscow, where

I lived with my parents as a child. 21. When they finally parted, he returned to the room

and went straight to the table. 22. It was much colder than she had anticipated. 23. I

I knew they had met before the war. 24. When everyone was gone, I carefully closed the door

the door. 25. When dawn broke, still blowing a Gale, but the snow had stopped.

Объяснение: