Lance Armstrong is believed ______drugs in the past competitive cycling races.
The transformation of our city will make _______ for people here to have a comfortable environment.
Mary _______ her mother with the housework, but she didn’t.
The local government announced that only when the fire was under control ________ to return to their homes.
He left home without saying a word, and _______ worries many people and is to be found out.
He came all the way to China for learning it better _______ for making money.