B=91/2+5/6+11/12+19/20+...+89/90)x100

it isn't important for you to finish the work today {need}

=>you don't

People regarded Chu Van An was considered as one of the most famous teacher at the Imperial Academy=>Chu Van An

Nêu biện pháp chống ơi nhiễm tiếng ồn do tiếng của xe cộ qua lại và tiếng còi xe inh ỏi

my son help me do the housework =>

find and corect the mistakes.

Every year several thousand people are kill in the Great Britain . Every year between one and two hundred thousand people injure. These people are killed or injured on road accidents. If you are in England and if you listen the eight o'clock news fro the BBC, you will often hear to news of road accidents. Accidents are often cause by careless. There are rule thich help to make te road safely, but in the fact that we know people do always obey the rule.