could't与couldn't的区别?这两个词都存在吗?表达的是一样的意思吗?

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• could't与couldn't的区别?这两个词都存在吗?表达的是一样的意思吗?
• --i __(can"t/couldn"t) answer the __(rest/finished).they were __(too/very)difficult for me.--i __(can"t/couldn"t) answer the __(rest/finished).they were __(too/very)difficult for me.--french __(paper/tests) are awful.--i"m __(think /sur) i"ve got a low mark.--perhaps we didn"t __(so /do) too __(bad/badly).如何选择?为什么?ll103 a2
• must not