#include <bits/stdc++.h>
#define endl "\n"
using namespace std;
 
int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
 
	int t;
	long int n;
    cin>>t;
    while (t--){
          cin>>n;
          long int a[n+5],dp[n+5]={0};
          for (int i=1; i<=n; i++){
          	cin>>a[i];
          }
          dp[1]=a[1];
          dp[2]=max(a[2],a[1]);
          for(int i=3; i<=n;i++){
          	dp[i]=max(dp[i-2]+a[i],dp[i-1]);
          }
          cout<<dp[n]<<endl;
    }
    return 0;
}

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MwoKNgoKNSAgNSAgMTAgIDEwMCAgMTAgIDUKCjMKMSAgMjAgIDMKCjUgCjMgMiA1IDEwMDAwMCA3

3

6

5  5  10  100  10  5

3
1  20  3

5 
3 2 5 100000 7