根据下列句子及所给汉语注释，写出空缺处各单词的正确形式。（每空只写一词）
The wedding party was delayed because of the late ______ (到达) of the minister who would marry the new couple.                               
There being 100 students singing at the concert, you’d better have a ____ (指挥) to keep them in time.                                   
So ______ (决心) was the disabled young man to study that a mixed university offered him an entrance prize.   
The _________ (交换) of goods had a symbolic meaning far more important than the value of the goods themselves.
Mary is _______ （乐观的）about her chances of winning a gold medal.
He has ________(总共) collected 1020 stamps.
She looks ________(面熟) to me, but I don’t remember her name.
Our party has now a correct ________ (政治)line.
A national conference will be held next ____________ (周三) to discuss the economic problems.
Children are taught to believe in the _______________ (原则) of equal opportunity for everyone.