用所给词的适当形式填空。 1. This __________ ( be ) m
题型：填空题
问题：
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 ).