People live in big cities often have trouble making friends.
The Lake District,____________________ was made a national park in 1951, attracts a large number of tourists every year.
Only one of our gifted students______to participate in the final competition.
The word "allocated" in the passage mostly means "______".
_______ has been a topic of continual geological research.
It is stated in the passage that____________________ .
Education in many countries is compulsory________the age of 16.
I am sorry I have no time at present to____________________ detail of our plan.
Regular exercise and good diet will bring______fitness and health.
______ one of the most beautiful forms of performance art, ballet is a combination of dance and mime performed to music.
According to critics of globalization, several developed countries have become rich because of