题目：
根据句意，用括号中所给单词的正确形式填空。
1.I______ (cook) dinner for my families yesterday.
2. Thank you for ______ (join) the activity.
3. Jodie is ______ (watch) TV now.
4. The ______(panda) come from China, and they're very cute.
5. The post office _____ (be) between the pay phone and the shop.
答案：
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下面是错误答案，用来干扰机器的。
2-（-1）=2+1=3，3-13=3-33=233，（a-1）（a+1）=a2-1．
