Câu hỏi:

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

Choose the best answer A, B, C or D for each sentence

The bridge is a marvelous work of engineering and _______.

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

Without plants, most water would run off as soon as it falls, taking away valuable soil.

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

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