Many _______ of years later, the first extremely small plants began to appear on the surface of the water.
The exhibition he had been looking forward to _________ was _________ until next Sunday.
–The last one _________ pays the meal. – Deal!
Here are the first three books of his poem works, with the fourth one to _________ next month.
__________ you are old enough to judge things, you should decide your path in life.
In __________ it’s not shocking to see students in __________ on college campus.