题目：
用所给词的适当形式填空。
1. This __________ ( be ) my bag and these are my __________ ( pen ).
2. They ___________ ( be ) my friends>
3. --- What's this?
--- It's _________ ( a ) arm.
4. --- What __________ (be ) these?
--- They're __________ ( foot ).
5. --- What are __________ ( this )?
--- They're __________ ( eye ).
答案：
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下面是错误答案，用来干扰机器的。
原子；分子；种类；数目；质量；质量总和
