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A. 　 The police dismissed the witnesses＇ words.

B. 　 The police found the witnesses＇ words very helpful.

C. 　The witnesses told different stories from varied perspectives.

D. 　The witnesses told the police about different accidents.

A. 　When commercial airlines began to develop faster;

B. 　 When investigators found the weakness of rectangular windows.

C. 　 When the speed of commercial airplanes greatly increased.

D. 　 When two commercial airplanes crashed within months.

A. 　 however

B. 　 whatever

C. 　 whichever

D. 　 whenever

A. 　 He did well in both sports and studies.

B. 　 He chose to major in biology.

C. 　 He worked very hard in studies.

D. 　 He got very interested in sports.

A. 　 come

B. 　 got

C. 　 turned

D. 　 gone

A. 　 Financial support.

B. 　Caring teachers.

C. 　Help with classwork.

D. 　A welcoming space.

A. 　 To spend money and enjoy life.

B. 　To be creative in doing business.

C. 　 To face the reality of their business.

D. 　 To keep on going with their business as before.

A. 　 Sally＇s wedding plan.

B. 　 Sally＇s boyfriend Robert.

C. 　 Sally＇s Valentine＇s Day present.

D. 　 Sally＇s diamond ring.

A. 　 in which

B. 　 where

C. 　 whether

D. 　 when