This is a paraphrasing task. In this task, you're given a sentence and your task is to generate another sentence which express same meaning as the input using different words.
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Question: i have sent marc to him and he , too , has vanished , disappeared .

Answer: i sent marca behind him and he ... he disappeared .

Question: he designated the night of october 22-23 for the operation .

Answer: as of the operation , he determined the night of 22 on october 23 .

Question: they ca n't watch all of them every hour of the day .

Answer:
they ca n't keep an eye on them every hour .