Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction in each of the following questions.
I found my new contact lenses strangely at first, but I got used to them in the end.
Giải chi tiết:
Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness.
Population growth rates vary among regions and even among countries within the same region.