//Awwawa! Dis cold yis ratten buy tEMMIE!
#include <bits/stdc++.h>
#define ll long long
#define maxn 100005 /*rem*/
#define mod 1000000007
#define db double
#define vi vector<int>
#define pb push_back
#define mp make_pair
#define pi pair<int, int>
#define fi first
#define se second

template <typename T> bool chkmax(T &x,T y){return x<y?x=y,true:false;}
template <typename T> bool chkmin(T &x,T y){return x>y?x=y,true:false;}

using namespace std;
ll ksm(ll a, ll b) {
   if (!b) return 1;
   ll ns = ksm(a, b >> 1);
   ns = ns * ns % mod;
   if (b & 1) ns = ns * a % mod;
   return ns;
}
int a[maxn];
int main() {
    int t;
    cin >> t;
    while (t--) {
        int n;
        cin >> n;
        int ans = 0;
        for (int i = 1; i <= n; i++) 
            cin >> a[i], 
            a[i] /= 2, 
            ans += a[i];
        for (int i = 1; i < n; i++) {
            ll cur = (a[i] + a[i + 1]);
            if (cur % 2) cur += mod;
            cur /= 2;
            ans -= cur;
            ans %= mod;
        }
        if (ans < 0) ans += mod;
        cout << ans << endl;
    }
    return 0;
}