Scientists are trying their best to_______ ways to treat the terrible disease caused by Ebola(埃博拉）．

38 Eric taught folk music in a local school for one year, ______ he spent some time abroad studying jazz

do you think of store shopping in the future－Personally, I think it will exist along with home shopping but ______.

g snow caused great ________ to thepeople living in the south of China, ________ some of them homeless

Li Feng won the first prize in the national English competition. —-Oh, really? I’m glad that his hard work at last _____.