THU IS GOING ___ A NEW BIKE NEXTWEEK.(TO BUY/BYING/TO BUYING/BUY)...

345. - 500 CAU TRAC NGHIEM TIENG ANH 6 7
500 CAU TRAC NGHIEM TIENG ANH 6 7

345. Thu is going ___ a new bike nextweek.(to buy/bying/to buying/buy).