1.li min made up his 【mind】to go to study abroadwhen he was 18 years old.
2.we should make a 【contribution】to improving our environment.
3.please don't 【enter】 without knocking the door.
4.there was all accident just now.a taxi 【crashed】near the railway station.
5.the bus stop suddenly.i 【banged】 my head ,but it is not too painful
6.the weather is bad now .all the city are hid in 【mist】
7.the high mountain is very 【steep】.almost no one can each the top of it .