He is a man of great experience , _______ much can be learned[ ]

In this university a medal with ten thousand dollars ____ gains success in science and technology every two years. [ ]

在英语中单个字母代表一个单词的是;____________

They’ve kept up a friendship with the teacher whom they were at school _____ twenty years ago

．_______we couldn’t understand was _______ more and more students went abroad aftergraduation.