The team are working hard to ___ the problem so that they can find the best solution.

ient ___private cars are for us, theymay also cause traffic accidents and pollution

(2013·高考江西卷)He wrote a letter________he explained what had happened in the accident.

about__________concert— It was too boring, you know,________concert for me

1In Japan, people sometimesgive special gifts. But they are not open. Later, people may thesame gifts to someone else.