亚历山大·格拉汉姆·贝尔发明了电话。

Alexander Graham Bell ___invented the telephone.

计算机是在20世纪发明的。

The computer was ___invented in the 20th century.

科学家们正试图发明一种治疗这种疾病的方法。

Scientists are trying to ___invent a cure for the disease.