Câu hỏi:

She was always very hard-working at school.

She went to live in another state after the break-up of her marriage.

In the first two decades of its existence, the cinema developed rapidly.

He is writing a book on the representation of woman in medieval art.

Population growth rates vary among regions and even among countries within the same region.

Barry seems happy enough working for himself.

Certain courses are compulsory; others are optional.