Alice had graduated from university and ____as a volunteer in the countryside when I contacted her last year.

omprehensive surveys have provided the most statements of how, and on what basis, data are collected.

下列各句中,没有语病的一句是（  ）

ler saved 1,200 Jews from death，so he is a real hero______thepeople who love peace．

The media can often help solve problems and draw attention _____situations ________help is needed.