题目内容

AIDS has become one of the first killers to human beings. Despite their lack of success so far, scientists have ________ in their research for a cure for AIDS.

A. . suspended
B. . retained
C. . insisted
D. . persevered

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Since the safety issue for school children has become more concerned by the public, in certain countries the law ________ parents to send their children to school.

A. . obliges
B. . conforms
C. . imposes
D. . submits

The politician was very skillful in persuading people, but this time people criticized him with severe comments as his speech was confusing and full of ________.

A. . contrary
B. . conflicts
C. . contrasts
D. . contradictions

The house needs to be remodeled, but ________ the terms of the contract signed, the tenant must get prepared to do it himself, not the landlord.

A. . as a consequence of
B. . in accordance with
C. . in the quest of
D. . in collaboration with

They attributed her success in her career ________ steady encouragement and generous help she received from her parents.

A. . on
B. . with
C. . to
D. . into