We need some more facts and data ____we make the final decision.
“我没什么可以奉献,有的只是热血、辛劳、眼泪和汗水。”发表这段演说的是( )
We are busy in preparing for the performance in order not to________in front of our classmates.
课文前两段主要写了什么内容?有什么作用?