Choose the word that has the main stress placed differently from that of the others.
A.scientist
B.president
C.engineer
D.astronaut

Choose the word that has the main stress placed differently from that of the others.
A.conquest
B.venture
C.technical
D.artificial

Choose the word that has the main stress placed differently from that of the others.
A.biography
B.psychological
C.approximate
D.congratulate

Choose the word that has the main stress placed differently from that of the others.
A.success
B.cosmonaut
C.extreme
D.appoint

Choose the word or phrase that best completes the sentence or substitutes for the underlined word or phrase.
The Cosmonaut Training Center at Star City, Russia was named ______ him.
A.of
B.on
C.for
D.after

Choose the word or phrase that best completes the sentence or substitutes for the underlined word or phrase.
China became the third country in the world to be able to independently carry ______ manned space flights.
A.on
B.out
C.off
D.over

Choose the word or phrase that best completes the sentence or substitutes for the underlined word or phrase.
Man has witnessed a great many significant ______ of science and technology in the past few decades.
A.achieves
B.achieved
C.achievers
D.achievements

It's high time we_____
A.to leave
B.were leaving
C.leave
D.had left

Choose the word that has the underlined part pronounced differently from that of the others.
A.foot
B.moon
C.look
D.would

But for his help, she_______
A.wouldn’t have failed
B.would have failed
C.has failed
D.has not failed