On________Children's Day, Jack received a fine present from his parents.
A.a B.an C.the D./
The guide dogs make a big difference________the disabled in daily life.
I made some notes to________myself of what I wanted to say in the meeting.
Don't eat too many desserts, ________you will have a toothache.
Bob has two brothers, but________of them lives in the same city as Bob does.
To keep safe, we shouldn't tell our personal________to strangers.
