25. ______exercise early in the morning has become part of his retired life.

iuwill show you around _______Mount Yuntai, because she has _____ good knowledgeof it.

_______, when Marx was already _______, he found it was important to study the situation in Russia, so he began to learn Russian.

ad prepared carefully for the exam, so that he could be sure of passing it on his first _______.

Teresa is ______ nervous ______ he can’t talk in front of the class.