十道英语选择题,四级左右难度.

十道英语选择题,四级左右难度.
21.________that the demand for power continues to rise at the current rate,it will not be long before traditional sources become inadequate.
A)Concerning
B)Regarding
C)Ascertaining
D)Assuming
22.We find that some birds _____twice a year between hot and cold countries.
A)migrate
B)emigrate
C)transfer
D)commute
23.As visiting scholars,they _______willingly to the customs of the country they live in.
A)submit
B)commit
C)conform
D)subject
24.The professor found himself constantly_______ the question:“How could anyone do these things?"
A)poring
B)pondering
C)presiding
D)presuming
25.In those days,executives expected to spend most of their lives in the same firm and ,unless they were dismissed for_______ ,to retire at the age of 65.
A)denial
B)deduction
C)integrity
D)incompetence
26.Her jewelry_______ under the spotlights and she became the dominant figure at the ball.
A)blazed
B)dazzled
C)glared
D)glittered
27.Weeks ______before anyone was arrested in connection with the bank robbery.
A)elapsed
B)expired
C)overlapped
D)terminated
28.Often such arguments have the effect of ______rather than clarifying the issues involved.
A)blocking
B)obscuring
C)tackling
D)prejudicing
29.He raised his eyebrows and stuck his bead forward and _______it in a single nod,a gesture boys used then for O.K.when they were pleased.
A)jerked
B)twisted
C)shrugged
D)tugged
30.She had recently left a job and had helped herself to copies of the company's client data,which she intended to ______in starting her own business.
A)dwell on
B)base on
C)draw upon
D)come upon