46. I doubt whether the medicine for losing weight which has been advertised on TV is really effective.
47. Learning the news that Ba Jin died / passed away, many people were in deep sorrow.
48. Many warm-hearted people in the society lent a hand to the child who was seriously ill.
49. The reason why the river is badly polluted is that the chemical factory has poured a great deal of waste water into it.
50. With the rapid development of economy, China is playing a greater role in international affairs.
51. Although he hadn't recovered from his illness, he set out to work.
52. It is absolutely necessary to relax yourself after a period of hard work.
53. A teacher should make every effort to make his lessons lively and interesting.
54. All the patriotic Chinese hope that China will be reunited as soon
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