①Cu2+ + 2OH- ==Cu(OH)2（沉淀符号）
②2H+ +CO32- ==H20+CO2（气体符号）
③Ca2+ +2OH- +CO2（少）==CaCO3(沉淀符号）+H20
④Cu2+ + 2OH- +Ba2+ +SO4(2-)==Cu(OH)2+BaSO4（均有沉淀符号）
⑤Ag+ + Cl-==AgCl（沉淀符号）
⑥Fe+Cu2+==Cu +Fe2+
⑦CaCO3+2H+==Ca2+ +H2O +CO2（气体符号）
⑧CH3COOH + OH- = CH3COO- + H2O
⑨2H+ + SO4(2-)+Ba2+ + 2OH-==BaSO4(沉淀符号）+2H2O
⑩Cu+2Ag+==Cu2+ +2Ag
Luckily,we had got home before it began to rain.
Zhang Hua said he had lost his notebook.
He had told me that the meeting was at 2,but when I arrived I had to wait till 2:30.
When he had stayed here for two or three days,he began to feel at home.