The young tribal man helped Mrs. Davidson find her way back, in return for________medical equipment was offered to him by the latter.
It is the test system, rather than the teachers, ____ is to blame for the students' heavy burden nowadays.
Many children are ____ in the countryside when their parents flood into the cities for jobs.
The UN officials say it could be many weeks and even months ____ a deal is reached.
Either the ways or the time ____ yet, but you may ask the headmaster for some information.
The purse found on the playground matches the ____ by Mary, so it must be hers.