It is too late to change it, so leave it the way it is.
A.We should change it before it is too late.
B.We should change it before we leave.
C.It can‘t be altered at this point.
D.We can’t leave it the way it is.

I don’t really think that he will accept our invitation.
A.It is unlikely that he accepts our invitation.
B.He is unlikely to accept our invitation.
C.He will be unlikely to accept our invitation.
D.It is unlike for him to accept our invitation.

At no time did the two sides look likely to reach an agreement.
A.The two sides had no time to reach an agreement.
B.The two sides never looked likely to reach an agreement.
C.If the two sides had had time, they would have reached an agreement.
D.The two sides never look like each other.

The trick made its first appearance twenty years ago.
A.The trick made twenty years ago on first stage.
B.The trick appeared to be made twenty years ago.
C.The first stage of the trick appeared twenty years ago.
D.The trick was first seen on stage twenty years ago.

According to the passage, which of the following two processes were involved in the submersion of guyots?
A.erosion and volcanic activity
B.the sinking of the sea floor and the rising of sea level
C.mountain building and the action of ocean currents
D.high tides and earthquakes

The author indicates that Arnold Guyot __________ .
A.was Harry Hess’s instructor
B.invented the fathometer
C.named the guyots after himself
D.taught at Princeton University

The author states that offshore canyons and guyots have which of the following characteristics in common?
A.Both are found on the ocean floor near the continental shelves.
B.Both present oceanographers with a mystery.
C.Both were formed by volcanic activity.
D.Both were, at one time, above the surface of the sea.

The word “conceal” is closest in meaning to _________ .
A.contain
B.erode
C.hide
D.create

Yuri Gagarin’s first space flight showed______
A.all the scientific equipment worked well
B.human beings could survive well in space
C.astronauts would not suffer from space sickness
D.scientists could develop weapons in space

The word “wears off’ is closest in meaning to_______
A.disappear
B.put off
C.come up
D.appear