Câu hỏi:

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

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

Select the synonym of the following bold and underlined word in each sentence in the unit

To conserve electricity, we are cutting down on our central heating.

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

I'm sick of _______-heart liberal politicians.

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

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