Nobody knew that Uncle Ben was coming to see us. He arrived______.
A.expectantly
B.unexpecting
C.unexpectedly
D.unexpected

Choose the word/phrase that has the CLOSEST meaning to the underlined one.
A nuclear station may take risk going off due to unexpected incidents.
A.developing
B.demolishing
C.running
D.exploding

Let's put off that meeting to next Monday.
A.appoint
B.arrange
C.schedule
D.postpone

She is looking _______ a new place to live because she does not want to depend _______ her parents any more.
A.after / with
B.up / forward
C.at / into
D.for / on

Scientific ________ help to explore some places and discover more and more remote parts of the world.
A.lead
B.expedition
C.research
D.survey

After Peter had returned from the Sahara desert, he was confined to bed by a ________ disease.
A.mysteriously
B.mystery
C.mysterious
D.mysteriousness

Some sand dunes may be over 200 meters ________ height.
A.on
B.with
C.in
D.at

________ is the process by which a piece of land becomes dry, empty, and unsuitable for growing trees or crops on.
A.deserted
B.desertify
C.desertification
D.desert

The desert biome includes the hottest places in the world because it absorbs more ________ from the sun than land in humid climates do.
A.hotly
B.heating
C.hot
D.heat

Over-exploitation for food, pets, and medicine, pollution, and disease are recognized _______ a serious threat _______ extinction.
A.as / of
B.over / with
C.upon / at
D.to / for