______the ozone layer were destroyed, most living things on the earth would disappear.
It is stated in the passage that____________________ .
_______ has been a topic of continual geological research.
As a millionaire who liked to show off her wealth, Mrs. Smith paid______________________________________________ we asked.
The word "allocated" in the passage mostly means "______".
We must push the piano to the corner of the hall to_____________________ our party tonight.
The phrase "keeps sellers on their toes" in the passage mostly means "______".
Education in many countries is compulsory________the age of 16.
Only one of our gifted students______to participate in the final competition.
According to critics of globalization, several developed countries have become rich because of
______ his brother, Mike is active and friendly.