15. An awful crash between an express train and a bus _____ , however, occur the other day in Russia.A. does B. did D. has to D. had to
This is a difficult and stressful job, but one ______ you can really help people.
After the earthquake, the Haitian(海地的) people needed to be helped ______.
______, a small advertisement held my attention, which read “Easy job. Good wages. No experience necessary.”
Obama says he is angry about policies that always favor the wealthy and powerful over ______ Americans and insists that opportunities be opened up to all.
It is required that all traffic participants should __ the traffic rules to make traffic safer and faster.