Aunt Betty ______ an English teacher since she graduated from the university.

Bo, the champion of the Voice of China, is a man of ________ few words but has ________ remarkable inner strength

If the service is awful, a customer has the right to _____ to the manager.

rmers were sure that fresh water lay____ in the earth, so they dug ____ to findit

Great changes _________ in Tongren in the past five years.