work on doing sth还是work on to do sth?

work on doing sth还是work on to do sth? work on doing sth造句? live on 后接doing sth 还是to do sth? move to do sth还是on doing sth? 是work hard at sth.还是work hard on sth. got an invitation to do sth 还是 on doing sth/in doing sth/of go on to do sth.与go on doing sth. hold on to do sth 还是hold on to doing sth on the way to do sth 还是on the way to doing sth hold on to doing sth 还是hold on to do sth go on doing sth,go on to do sth,continue doing sth,continue work on to do和work on doing