题目

At the end of the 16th century, about five to seven million people spoke English. Later in the next century, people from England made voyages              __21__conquer other parts of the world and because of that, English began to__22__ (speak) in many other countries. Today, more people speak English as their first, second or foreign language than__23__before. Native English speakers can understand each other__24__they don’t speak the same kind of English. So why has English changed over__25__?  __26__ (actual) all languages change and develop when cultures meet and已知抛物线上一点到其焦点的距离为，则m＝       .