“Why don’t you sit down and ______?”
_______ has been a topic of continual geological research.
The pool should not be made so deep______small children can be safe there.
The phrase "keeps sellers on their toes" in the passage mostly means "______".
It is stated in the passage that____________________ .
Education in many countries is compulsory________the age of 16.
Regular exercise and good diet will bring______fitness and health.
Only one of our gifted students______to participate in the final competition.
The boat was sailing north when a terrible storm_____________ .
Standing on the tip of the cape,____________________ .
According to critics of globalization, several developed countries have become rich because of