Choose the best answer to complete the following sentences.

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

Mark the letter A, B, C, or D on your answer sheet to indicate the word that has the underlined part pronounced differently from the others.

Mark the letter A, B, C or D on your answer sheet to choose the word whose underlined part is pronounced differently from the rest.

Choose the word that has the underlined part pronounced differently from the others.

Choose the word whose underlined part is pronounced differently from that of the others.

Choose the word whose stress is put differently from that of the others.

Choose the best option to complete the following sentences.

To ___________ is to keep and protect something from damage, change or waste.

Choose the best answer to complete the following sentences.

The vegetation layers in Cat Ba Archipelago form spectacular and scenic landscapes and make the site become                    of all Vietnam's typical ecosystems.