Multitable Select

I have 2 tables involved in a select statement that I cannot figure out quite how to do.

Table 1- GroupedItems
int SharedId
int GroupId

Table 2- SharedItems
int SharedId
int ItemId


In Table 1 SharedId is unique
In Table 2 ItemId is unique

Table 1 represents all of a group's shared Items
Table 2 matches a group of Items to a common sharedId

Example
Table 1
1 - 1
2 - 1
3 - 2

Table 2
1 - 1
1 - 2
2 - 3
2 - 4
3 - 5


What I am trying to do is have a select command where you would pass in a GroupId and it would select just one Item from table 2 for each SharedId

If you were to specify Group 1 you would Get
ItemIds 1 and 3 from Table 2, although its not needed that the results are the top items.