Tom, clean up the broken glass _________ someone walks on it.
When ______ why he behaved that way at table,he made no reply.
The problems_______ at the meeting tomorrow are really hard to solve.
______ in a red skirt in the opening ceremony of the 2008 Olympic Games, the little girl Lin Miaoke won the hearts of the people all over the world.
There was a sudden burst of light ______ a terrible noise.
Every time he had a chance,he would talk about the great difficulty he had _____ in the new country.