Fill in the blanks with the proper words in their correct forms according to the Chinese meaning of each sentence. Testify justify verify certify 他作证说他没有看见那次事故。 1. He ____that he had not seen the accident. 不要为自己的缺点辩护。 2. Don't try to____ your mistakes. 他想一切办法来验证这个理论。 3.He tried in every way to ___this theory. 医生确诊他精神失常。 4.The doctor ___him insane.