Bằng phương pháp hóa học, nhận biết các dung dịch sau đựng trong các lọ riêng biệt không dán nhãn: CaCl2, K2SO4, Na2SO3 và Na2S. Viết phương trình hóa học của các phản ứng xảy ra.

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I Choose A, B, C or D to complete the following sentences: 1. My cousin is ……………………… university student. A. an B. a C. the D. X 2. Such ………………….. as sugar, sugarcane, and coconut water are mostly used in Southern Vietnamese food than in Northern and Central Viet Nam. A. dishes B. courses C. ingredients D. menus II Write a 100-120 word paragraph about what you use English for in your daily life. You can use the following ideas as cues: - Communicate with people all over the world - Get information - Improve knowledge - Be useful when you want to go abroad to study - Expand career potentials. ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………..………………………………………...............................................................