The cat gave the old lady a lot of help when she way young.

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• The cat gave the old lady a lot of help when she way young.
• The cat gave the old lady a lot of help when she way young.
• The cat is now very old.She cannot bite.When the old cat sees a mouse,she jumps to it and catches it,but the mouse still gets out of her mouth and runs away.Then the old lady is very angry.She begins to beat the cat.The cat says to her,"Don't beat me.Please be kind to me.When I was young,Igave you a lot of help.
• 现在完成时,使用 since,up till now,so far,yet,for填空,每个词语只能使用一次.
• 今有一混合物的水溶液，只可能含有以下离子中的若干种：Na+、NH4+、Ba2+、Cl-、CO32-、SO42-.现取两份200mL溶液进行如下实验：①第一份加足量NaOH溶液，加热，收集到气体0.68g；②第二份加足量B