问题描述：
根据所给要求,改写下列句子：（1）The pen cost him (5 yuan).(对括号部分提问）
（2）We want to come back at the end of August.(改为一般疑问句）（3）We want to come back at the end of August.(保持句意不变）（4）They are going to visit the Great Wall this summer.(改为一般疑问句）（5）I spend 30 minutes getting to the party.(保持句意不变）（6）Give me a cup of tea,please.(保持句意不变）（7）My parents visit my grandparents (once a week).(对括号部分提问）（8）This is a heavy box.I can't carry it.(保持句意不变）（9）There were some students in the library.(改为否定句）
（2）We want to come back at the end of August.(改为一般疑问句）（3）We want to come back at the end of August.(保持句意不变）（4）They are going to visit the Great Wall this summer.(改为一般疑问句）（5）I spend 30 minutes getting to the party.(保持句意不变）（6）Give me a cup of tea,please.(保持句意不变）（7）My parents visit my grandparents (once a week).(对括号部分提问）（8）This is a heavy box.I can't carry it.(保持句意不变）（9）There were some students in the library.(改为否定句）
问题解答：
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