SQL Server Cluster Index

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SQL-Server

Hi Experts,
I have one question Regrading Cluster Index on P.K Column.
Suppose we have data in my table

Col1(P.K Cluster Index)
101
102
103
104
105
106

Now I run Two Command
1)Delete the Record 3rd position
Delete From tbl where Col=103
2)I insert the record like 10 value in Col.
Insert into tbl values('109')

First Question when we delete the record index rearrange the order of
record Internally in B-Tree or Left the Blank space as it is.

Second when we insert the record it always add at the end of
the B-Tree or in Blank space.