Yesterday was my 18th birthday. As Father and Mother thought it____ (be) a big occasion for me, they suggested I ____ (held) a birthday party at home to celebrate it. For several days they had been busy ____ (prepare) for this. By 4 o'clock I was pleased to see all my friends had come ____ a lot of beautiful presents.

    We spent a wonderful night together, ____ (happy) talking and eating. One of ____ most exciting moment was when Mother put a big birthday cake on the table and all my friends began to sing Happy Birthday. Seeing the 18 candles burning, I couldn't keep back my ____ (tear). Without Mother and Father's love, I would not lead such a happy life now. Mother asked me to make a wish before I blew out all the candles. After that, everyone enjoyed the sweet birthday cake and shared my happiness.

    I am eighteen years old now, ____ means I've become an adult and have ____ (many) responsibilities. I'll do my best to return my parents' love and live up to ____ (they) expectations.

 将稀盐酸慢慢滴入盛有氢氧化钠溶液的烧杯中，用温度计测量烧杯中溶液的温度，温度随加入稀盐酸的质量变化曲线如图所示．

（1）在滴加的过程中，烧杯中溶液的pH逐渐____（填“增大”、“减小”或“不变”）．

（2）由图可知，稀盐酸与氢氧化钠溶液发生的反应是____（填“放热”或“吸热”）反应．

（3）图中B点时，溶液中的溶质是____ （填化学式）．

观察下图，a、b、c、d四条曲线代表的是四个国家的世界制造业产值，其中b、c曲线分别代表的国家是（   ）