It’s obvious that the Beijing Olympic Games _______ a great success．

_______ new decision has been made that those who cheat in _______ examinations will not be recommended to colleges or universities.

then, more than 2 billion apps have beendownloaded at prices ________ free to $900.

依次填入下列各句横线处的成语，最恰当的一组是（ ）（1）对于深陷危机的巴西足球队，外界唱衰的论调尤甚。巴西人能让这些担忧随着奥运的开幕 吗（2）岁月变迁，曾经在上海街头风光一时的老艺人们 ，经历着各自不同的命运。（3）由于森林不断退化和消失，至上世纪90年代末，东北虎在中国境内基本 。

lish class, our teacher often createsan environment _____________ we are given the opportunity to solve problemsourselves.