1).I have warned you _________to keep away from drug.(over)

1).I have warned you _________to keep away from drug.(over)
2).If you try to learn too many things________,you may get confused.(time)
3).We don’t know if the plan will work until we __________.(practice)
4).You can’t learn English well without ________idiomatic ways of saying things.(watch)
5).Peter has tried many things with no particular success,but he is _______an incapable person.(means)
6).Can you turn the music down,please?I can’t _______my work.(concentrate)
7).__________teaching at the university,Professor Wilson also works as a legal adviser to a high-tech company.(addition)
8).If you come to my office,I’ll tell you the story ______.(detail)