Vocabulary: Choose the best answer among A, B, C or D that best completes each sentence.

1. Since the appearance of electronic devices, lessons have become more and more _____ and effective.
A. enjoyable B. disruptive C. accessible D. inappropriate
2. The phrase “____ natives” refers to people who are familiar with computers and the Internet from an early age.
A. device B. portable C. electronic D. digital
3. Burning garbage _____ dangerous gases to the environment, and this may lead to global warming.
A. throws B. sends C.emits D. rejects
4. Intensive pesticide and fertilizer sprays used in agriculture have resulted in the serious____of water, soil and land.
A. protection B. pollution C. deforestation D. consumption