.(Выпиши сначала существительные с артиклем а затем с артиклем an
doll, window, chair, iron, sofa, cat, pupil, octopus, hand, umbrella. plate, pen, elephat, lion, onion. mouse, baby. armchair, friend, dinner, evening, computer, family, bear, ear, frog, horse, egg, snake, eagle, zebra, apple, girl, boy, mother, doctor, engineer, policeman, house, eye, table, footbal, plw, cow, rabbir, uncle, schoolbag, artist, chair, cap, aunt, tree, father, aeroplane, crocodile, bokk. pencil, child, lemon, orange, park, garden, coat, bus, afternoon, snowball, grandmother.).

a: doll, window, chair, sofa, cat, pupil, hand, plate, pen, lion, mouse, baby, friend, dinner, computer, family, bear, frog, horse, snake, zebra, girl, boy, mother, doctor, policeman, house, table, footbal, plw, cow, rabbit, schoolbag, chair, cap, tree, father, crocodile, book, pencil, child, lemon, park, garden, coat, bus, snowball, остальное на an

1-с, т.к. после who ставится is, но т.к. есть last sunday как показатель прошедшего времени ставим was.  2-а, т.к they-множественное число, из предложенных вариантов подходит только а)) 

1.homestay is the best option who study abroad

2.i am very sociable and friendly so communication is for me

2 i always need an information tu undesrtand the material better

3i like this music it sounds quite good

4i read a lot and i think thats very important thing for my future life

5 i often use a vocabulary when i dont know how to translate the word