（1）下列物质中能导电的是____ ，属于强电解质的是____ ，

①H₂SO₄，②熔融硫酸钠，③NH₃•H₂O，④CO₂，⑤碳酸钙，⑥CH₃COOH，⑦氯气，⑧石墨．

（2）某温度下，将50mL 0.2mol/L MgCl₂溶液与50mL 0.2mol/LNaOH溶液充分混合．经判断：____ （选填有或无）沉淀生成，依据是　____ 已知此温度下（K_SPMg（OH）₂=1.8×10^﹣12）

（3）常温下，0.1mol•L^﹣1NaHCO₃溶液的pH大于8，则溶液中c（H₂CO₃）____ c（CO₃^2﹣）（填“＞”、“=或“＜”），原因是____ （用恰当的化学用语和必要的文字说明回答）．

       Last week our class went to the zoo as part of our science project. We spent a few hours1there. We didn't do much studying. We just had a good 2 . We left for the zoo by bus at 9:00 and 3 at the zoo half an hour later. There are all kinds of 4 in the zoo. And the animals have many good 5 for us. We all wanted to watch the elephant show at 10:00. But before that we went to look at snakes because it was a part of our project. I don't like snakes because they are so 6. The elephant show lasted 45 minutes. It was really nice. I didn't know elephants can play soccer so 7! Then we had a 15-minute break for a drink, we went 8  the zoo trying to see as many animals as we could before 9. Lunch was fun because we had it 10 monkeys. We went back on the bus at 2:00. It took 30 minutes to get back to school.