17.on

(1)Have you a match on you?（随身带） (2)Susan is on the committee.（⋯之一员）

(3)The soldiers were marching on the enemy's capital.（表方向） (4)He has retired on a pension.（依靠）

(5)Yon should act on your lawyer's advice.（依据） (6)Their house is on the main road.（靠近）

(7)They suffered disaster on [upon] disaster.（加，添） (8)This news is on good authority.（根据）

(9)She is an authority on English grammar.（关于） (10)John sat on my right.（在⋯旁边）

1. On [upon] arriving there, we began to work immediately.（在⋯ 后立即）

2. They are on a friendly visit to Japan.（处于⋯状况中）