I listened to Professor Chen-Ning Franklin Yang’s lecture about his study and physics, but I failed to get its key ______ .
Elephants like ________ but lions like ________.
Let’s ________ football this Sunday.
— Does Mike like cats? — ________. He plays with his cat every day.
________. Can you tell me the way to the library?
— Are you ________, Mona? — Yes. Let’s buy some hamburgers to eat.