问题描述：
把下列单词填空
Plural with a /s/ sound：
Plural with a /z/ sound：
Plural with a /iz/ sound：
office assistants sales rep employees office girls jobs keyboard operators mechanics Customs officers
air hostesses engineers taxi drivers
Plural with a /s/ sound：
Plural with a /z/ sound：
Plural with a /iz/ sound：
office assistants sales rep employees office girls jobs keyboard operators mechanics Customs officers
air hostesses engineers taxi drivers
问题解答：
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