They their living by selling fruits and vegetables. 1)gain2)have3)earn4)win

They their living by selling fruits and vegetables.

3)earn

They gain their living by selling fruits and vegetables
А теперь как я это узнала.
Сначала переводим текст получается
Они себе на жизнь продавая фрукты и овощи.
Затем переводим данные варианты:
gain- зарабатывают, have- имеют, earn- получать, win- победить.
Смотрим что подходит и вставляем у нас это ответ 1) gain

1.our granny always bake something tasty, when we come to visit her.
2.will you give me the disk with another film, when I will watch these?
3.you can call me, if you'll have some questions.
4.while Tome hadn't lunch, he isn't have to eat sweets.
5.if Anna already wrote a summary, we call her to go with us for a walk.
6. What will you do, if you don't buy train tickets?
7.if you still cook dinner, I'll watch news on TV.
8. You will have some problems with health, if you'll lunch in fast food restaurant
9.will you help me, when you'll get free? - yes, if I'll get my work fast, I'll help you.
10.while he won't get higher education, he haven't start his own business.

 1. My grandmother always cooks something tasty when we come to visit her.
2. You give me a disk with another film, when I look at this?
3. You can call me if you have any questions
4.While Tom did not have dinner, he can not eat sweets.
5.If Anna had already written essay, we will invite her to go with us to the movies.
6.What will you do if you can not buy tickets on the train?
7.If you're still preparing dinner, I watch the news on TV.
8.You will have health problems, if you will dine in fast food restaurants.
9.Will you help me, when released? - Yes, if I quickly did my job, I'll help you.
10.Until he graduated, he will not be able to start their own business
                                 
                                    Надеюсь