有六种物质：a.食盐 b.熟石灰 c.稀盐酸 d.硝酸钾 e.明矾 f.碳酸氢钠。请据此回答（填字母编号）

(1)常用于改良酸性土壤_____ ；

(2)可用于金属除锈的是_________；

(3)属于复合肥料的是_______ ；

(4)可用于治疗胃酸过多症的是_______；

(5)常用作净水剂的是______。

请根据句意、中文提示或英语释义写单词。

小题1:—Can you work out the maths problem in a __________ (简单) way?

—Sorry, I can’t. 

小题2:The football player ___________ (重) 70 kilos before he went on a diet.

小题3:Tom has lost his job, so he can’t ____________ (have enough money to buy or do something) a new car.

小题4:Spiderman is one of the most famous comic book ____________ (someone you admire very much) of all time.

小题5:Dr Ma works for ORBIS and he performs operations in a flying eye _____________.