请将下列每题所给的句子合并成含有宾语从句的复合句.

请将下列每题所给的句子合并成含有宾语从句的复合句.
4.Why is Bob late for school?Please tell us .
5.Who will give a talk at the meeting tomorrow?Do you know?
6.Hom many people are there in the room?Tom asks.

1.Please tell us why Bob is late for school.
2.Do you know who will give a talk at the meeting tomorrow?
3.Tom asks how many people there are in the room.

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