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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 ).