Câu hỏi:

Choose the word whose underlined part has a different pronunciation from the others in each group

He says he'll tell the authorities but it's just an empty ______.

He owns a series of _______ across the US and beyond.

Choose the word whose main stress is placed differently from the others in each group

Each year about fifty hundred species of plants and animals are already being eliminated.

But we can stop adding the problem while scientists search for answers, and laws are passed in nature’s defense.

This is especially worrying when there are about 3,000 plants with values as medicines against cancer, AIDS, heart disease and many other sicknesses.