Hefound_______difficulttostudymaths.
A、itA
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The Western Council for Travel Research in _______ employed the term visitor.
InEurope_______arethetwoleadingcontendersforaglobalreservationssystem.
By the middle of the 21st century, the vast majority of the world ’s population will be living in cities _______ in the country.
A well-known example of the large scale destruction of an ecosystem through vegetation removal to accommodate tourist facilities is the case of the _______.
Thisis________goodreadinghabitsarenotonlyanimportantstudyskillforthestudent,butalsoanimportantlifeskillforanyone.
