1.He made a speech after his success, ________(owe) it to his tutor.
2.Mr. Smith took up golf after his____________(retire) from the position.
3.Recently, the noise outside has been____________(bother) us neighbours.
4.The young teacher enjoys great____________(popular) from his students.
5.What the teacher told us about selfconfidence________(strike) importance of it into my heart.
6.__________(initial), find the cause of this kind of problems.
