________ several years he hasbeen working like this

ctory used 65 percent of the raw materials,the rest of which saved for other purposes.

MsLi’s business _________ very quickly She opened her first store two years ago;now she has fifty stores all over the country

s and teachers always think students should spend more time on their studies, but students themselves think _____.

Though Jack was poor and sick, he never ______ any chance to write. That is why he finally became a successful writer.