The word “they” in paragraph 1 refers to ______.

Choose the word whose underlined part is pronounced differently.

Choose the word whose underlined part is pronounced differently.

Choose the word whose stress is placed in different position from that of the rest.

Choose the word whose stress is placed in different position from that of the rest.

Choose the best answer to complete the following sentences.

A(n) _________disease is an illness that can be passed from one person to another.

Choose the best answer to complete the following sentences.

Global warming leads _______ climate change.

Choose the best answer to complete the following sentences.

Global warming is an increase in the average _______ of the earth’s atmosphere.