Прочитай приведённый ниже текст. Преобразуй слова, написанные заглавными буквами в скобках после пропусков, обозначенных номерами 29–34 так, чтобы они грамматически и лексически соответствовали содержанию текста. Заполни пропуски полученными словами. Каждый пропуск соответствует отдельному заданию 29–34. Humans, sadly, have a pretty poor sense of smell. In fact, most animals have much sharper noses than we do. So humans often train animals to do 29.__________ (SMELL) jobs. Trained dogs and rats can smell out everything from explosives to a 30.__________ (SICK). Pigs are also talented sniffers. They are used to hunt for truffles, a yummy mushroom that grows underground. But putting animals on smell duty has some problems. Animals are 31.__________ (EXPENSE) to train. They get tired and bored. They need human handlers. Could we make an electronic nose that could do the job? Many researchers are working on it. They make sensors out of materials that change when they meet 32.__________ (DANGER) chemicals. This triggers a signal on a screen or sounds an alarm. One lab at the Georgia Institute of Technology is making 33.__________ (HELP) devices that would smell the air, just like a dog or rat. So far, animal noses are still much better at catching 34.__________ (EXACT) the necessary smells. But someday, the robots may have all the truffles.