i have to be on top of the matter?

i have to be on top of the matter? Have to be at the middle/front/top of I am on top of the world| When you hit the wall Think of me I’ll be on the top just wa There used to be a house_____ on the top of the mountain. its just the ball on the top,nothing to be scared of There used to be a house ___ on the top of the mountain. There used to be a house _____ on the top of the mountain. [ We sat on the top of the mountain to watch the sun _ early i 英语翻译I will have a big meeting with my sellers on the top of 英语翻译Climbing on me,you can be very close to top of the world (How Does It Feel To Be) On Top Of The World的歌词?