1. Thank you very much for helping me ______ my bicycle yesterday. You really gave a hand.
(A) remind
(B) repair
(C) revise
(D) repeat

47. Which of the following is closest in meaning to the word “convey” in paragraph 2? (A) Fasten. (B) Regulate. (C) Analyze. (D) Express.

48. Which of the following statements is NOT true? (A) Normal children learn the whole system of language from hearing others using it. (B) Other animals like chimpanzees and bonobos can express thoughts and feelings like human beings. (C) The attempts to teach apes some version of human language are limited to some fundamental results. (D) Animal communication system is used to express something immediately present in space and time.

49. The last paragraph is ________. (A) an example that supports the conclusion (B) a warning to the readers (C) a summary of the whole article (D) a series of questions and answers

50. What is the conclusion of the passage? (A) Every human language has a vocabulary of thousands of words, built up from several dozen speech sounds. (B) Animal communication systems typically have at most a dozen distinct calls. (C) The properties of human language are unique in the natural world. (D) Human language can express thoughts on an unlimited number of topics.

2. My parents and I often______ to clean up the beach with neighbors on weekends. We feel happy that we can do something for the Earth. (A) donate (B) survive (C) vote (D) volunteer

3. The recent terrorist ______ in Australia and Europe raised concerns about national safety all over the world. (A) attacks (B) attractions (C) insults (D) pollutions

4. The old couple celebrated their fiftieth wedding______ in a famous Italian restaurant. All their children and grandchildren attended the party. (A) operation (B) occasion (C) marriage (D) anniversary

5. Facebook,Google+ ,Twitter,and LINE are among the most popular social ______ services that connect people worldwide. (A) masterwork (B) message (C) networking (D) negotiation

6. Bird flu, a viral disease of birds, does not usually ______ humans; however, some viruses, such as H5N1 and H7N9, have caused serious diseases in people. (A) infect (B) inform (C) illustrate (D) inflate

7. People who speak more than one language fluently process information more easily than those who know only one language. (A) apparently (B) especially (C) smoothly (D) simply