People in China used to keep records by putting a number of stones together, ___?
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.
I read about it in some book or other,does it matter__________it was?
I still remember__________this used to be a quiet village.
—I drove to Zhuhai for the air show last week.—Is that__________you had a few days off?