Choose the best answer to complete each sentence.
_____ calculations have shown that the earth’s resources may run out before the end of the next century.
A.Raw
B.Rude
C.Crude
D.Blunt

Choose the best answer to complete each sentence.
Beneath the streets of a modern city _____ of walls, columns, cables, pipes, and tunnels required to satisfy the needs of its inhabitants.
A.where exists
B.the network’s existence
C.the existing network
D.exists the network

Choose the best answer to complete each sentence.
_____ they are widely perceived as gentle creatures, hippopotamuses are responsible for more human deaths in Africa than any other animal.
A.Despite
B.Even though
C.In spite of
D.Because

Choose the best answer to complete each sentence.
Phone mebeforeten;_____ I’llbetoobusy totalktoyou.
A.unless
B.whether
C.otherwise
D.if

Choose the best answer to complete each sentence.
In most _____ developed countries, up to 50% of _____ population enters higher education at some time in their lives.
A.Ø / Ø
B.the / Ø
C.Ø / the
D.the / a

Choose the underlined part named A, B, C, or D that is incorrect.
Most oxygen atoms have eight neutrons, but a small amount have nine or ten .
A.Most
B.have
C.amount
D.nine or ten

Choose the underlined part named A, B, C, or D that is incorrect.
Dolphins and chimps are like in that they have been shown to have language skills.
A.are
B.like
C.in that
D.have been shown

________ (1)
A.participate
B.participated
C.participating
D.participately

Choose the best answer to complete each sentence.
_____every industry in our modern world requires the work of engineers.
A.Wholly
B.Hardly
C.Most
D.Virtually

Choose the best answer to complete each sentence.
When the electricity failed, he _____a match to find the candles.
A.rubbed
B.scratched
C.struck
D.started