—I can never forget the days we spent together in the summer camp.—Well, especially the day it suddenly began to rain in the middle of the night.
—I think it is going to be a big problem. —Yes,it could be. —I wonder__________we can do about it.
In the after-class activities,the students had plenty of_________ and gained a lot of practical _________.
She is American,__________she knows little about American history.
The science of medicine,__________progress has been very rapid lately,is perhaps the most important of all the sciences.
Information has been put forward__________more middle school graduates will be admitted into universities.