n=4*10**5+10
a=[0]*n
b=[0]*n
c=1
d=1
mod=10**9+7
a[0]=1
b[0]=1
for i in range(1,n):
    c*=i
    c%=mod
    d*=pow(i,mod-2,mod)
    d%=mod
    a[i]=c
    b[i]=d
for i in range(int(input())):
    h,w=map(int,input().split())
    ans=a[h+w-2]*b[h-1]*b[w-1]%mod
    print((ans-1)*2%mod)