The tour of the cave system is the main _______ for tourists in Phong Nha Ke Bang National Park.

Like any other universities, the Open University can give you a degree. However, you don’t have to (26)______ working to study. It can also open up a whole variety of interests.

When a student enters a college or university, he/she has to choose a main subject of study, which is called ___________.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

A(n) _________disease is an illness that can be passed from one person to another.

When people finish a postgraduate course, they can get a ____________.

Global warming is an increase in the average _______ of the earth’s atmosphere.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

The lecture is about the ______ of the world heritage sites.