John was born _____ June 6, 1985. [ ]
Mr. Zhang ________ to school on the school bus every day.
There is a wire pole along the road _________ meter.
When ______ comes to research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.
Mr. Jenkins has been busy with his work these days and seldom _________ to come over to have a chat with me.