NASA, the National Aeronautics and Space_______is an American govermment organization concerned with spacecraft and space travel

They never came to class late, _________.

Forty years after (A) Yuri Gagarin became the first man in orbit (B), Dennis Tito, an American businessman has become (C) the world (D) first space tourist.

Hobbies are activities in which one (31)_______strictly for entertainment.

Excuse me, but there is something about _______ immediately.

The path was made by walkers ________ the mountains each year.

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

The use of more natural and renewable energy sources is needed to take the burden off our current dependence on _______.