I listened to Professor Chen-Ning Franklin Yang’s lecture about his study and physics, but I failed to get its key ______ .

“What’s this? ”“ ________. ”

 They didn't provide __________ for Mr. Brown, so he had to find a hotel to live in.

Mr. Wu is a teacher with _______. He often tells us some of his unusual _______ in America.

— _________honey would you like? —Three _________.