补全英语单词 Sam bought several c____ of this book for his friends.

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• 补全英语单词 Sam bought several c____ of this book for his friends.
• 补全英语单词 Sam bought several c____ of this book for his friends.
• when he wpke up,he heard the_of knocking at the door.
• on Tuesday afternoonCan you come to my party on Saturday afternoon?和What are you doing Tuesday afternoon?为什么其中一个句子要加“on”另一个没“on”?这是课本上的句子。