together with two boys,____for having broken the rule

to the measures ______ by the localgovernment , the polluted river is becoming clearer and clearer and fish havebegun to show up in it

Safety in school has been of great concern (关注) because of recent reports about accidents _____ students got injured or killed at school.

The life of a professional tennis player is tough________ you never seem completely free to do _______ you like — even in theoff-season

We’re very annoyed ____his mistake, because we have emphasized this for several times