Ruth Amos won the prize a 3 years ago for her invention, the 'StairSteady', which helps old people to go up and down stairs. It is 4 from a strong metal and is very safe, as well as being simple to use. Ruth 5 sold over 1,000 StairSteadys all around the country.

Разберем задание.

Необходимо вставить подходящее слово в пропуск.

1. Под номером 3 необходимо вставить слово, которое указывает на количество лет. Подходит слово few.
2. Под номером 4 необходимо вставить слово, которое характеризует предмет. Подходит слово made.
3. Под номером 5 необходимо вставить слово, которое указывает на действие, произведенное с предметом. Подходит слово has.

Соберем текст целиком.

Ruth Amos won the prize a few years ago for her invention, the 'StairSteady', which helps old people to go up and down stairs. It is made from a strong metal and is very safe, as well as being simple to use. Ruth has sold over 1,000 StairSteadys all around the country.

Ответ: few, made, has.