We were not good friends ________we saw each other, but gradually, we got along better and better.
A.until B.when C.if
My sister has gone to work in Beijing, not for money, but ________ herself.
A.improve B.improved C.to improve
I hear that it often ________ in Sichuan and there are usually floods, especially in summer.
A.rains B.rained C.will rain
Mary is my English teacher ________ not only teaches me knowledge but also how to be a good person.
A.She B.which C.who
—Sally, I have ________ exciting to tell you. We will go back to school soon.
—Great！
A.anything B.something C.everything
Among all these books, ________ of them are for children to read.
A.three fifth B.three fifths C.threes fifth
