—______________have your grandparents been in Sanya?
—Five months. They will be back soon.
A.How soon B.How long C.How often
—Could you tell me______________?
—In the library. He was preparing for his papers when I saw him.
A.where you found Mr. Black B.where did you find Mr. Black C.where you find Mr. Black
Kim has been the first DPRK leader（朝鲜最高领导人）to cross the border（分界线）onto the Korean soil______________ the end of the 1950-53 Korean War.
A.since B.until C.after
—I believe there must be some wonderful experiences during our ______________middle school life.
—I believe so. Each of us learns a lot and gets along well with our teachers and classmates.
A.four years B.the four-year C.four-year
We can share our success with others if we get along well with others and cooperate with them. Also,we'll feel the love and care ______________others.
A.for B.from C.about
If we want to improve efficiency（效率）in class,we should do a lot of ______________before class,which can lead us to the lessons very quickly.
A.popularity B.preparation C.population
