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

He ______off alone a month ago, and of since.
A.set - hasn‘t been heard
B.setted - hasn’t heard
C.set - hasn’t heard
D.setted - hadn’t been heard

A.advise
B.riverside
C.practise
D.describe

A.unimportant
B.dust
C.cut
D.campus

A.share
B.care
C.are
D.scarely

An eyewitness described how ten people________ in the fire.
A.were killed
B.had been killed
C.had killed
D.had been being killed