—Where did you get this book?—I picked it up from a secondhand bookshop if you ________ know.
二、单项填空(共15分)21. ---I’m sorry I shouldn’t have laughed at you the day before. --- _________ .
Great changes have taken place in that school. It is no longer ______ it was 20 years ago, ____it was poorly equipped.
The teacher’s efforts ______ when one of his students was admitted to Beijing University last summer.
It is a beautiful car, but it is not ______ the price that I paid for it.
_______ natural resources it is one of the poorest countries in Europe.