use std::io::Write;
use std::collections::*;

type Map<K, V> = BTreeMap<K, V>;
type Set<T> = BTreeSet<T>;
type Deque<T> = VecDeque<T>;

fn run() {
    /*
    let n = 100;
    let x = 2;
    let mut win = vec![[[false; 2]; 2]; n + 1];
    for i in 1..=n {
        for j in 0..2 {
            for k in 0..2 {
                win[i][j][k] |= !win[i - 1][k][0];
                if j == 0 && i >= x {
                    win[i][j][k] |= !win[i - x][k][1];
                }
            }
        }
        let w = win[i][0][0];
        if x % 2 == 1 {
            assert_eq!(i % 2 == 1, w);
        } else {
            let r = i % (x + 3);
            if r < x {
                assert_eq!(r % 2 == 1, w);
            } else {
                assert_eq!(r % 2 == 0, w);
            }
        }
    }
    */
    let out = std::io::stdout();
    let mut out = std::io::BufWriter::new(out.lock());
    input! {
        t: usize,
        ask: [(usize, usize); t],
    }
    for (n, x) in ask {
        let mut ans = 0;
        if x % 2 == 1 {
            ans += (n + 1) / 2;
        } else {
            let q = n / (x + 3);
            let r = n - q * (x + 3);
            ans += q * ((x + 2) / 2 + 1);
            if r < x {
                ans += (r + 1) / 2;
            } else {
                ans += x / 2 + (r - x + 1) / 2;
            }
        }
        ans %= 998244353;
        writeln!(out, "{}", ans).ok();
    }
}

fn main() {
    run();
}

// ---------- begin input macro ----------
// reference: https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
#[macro_export]
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

#[macro_export]
macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};
    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

#[macro_export]
macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };
    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };
    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };
    ($iter:expr, bytes) => {
        read_value!($iter, String).bytes().collect::<Vec<u8>>()
    };
    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };
    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}
// ---------- end input macro ----------