—____ is Mary? —She is five. A. Who B. What C. How old
---Can you describe_______? ---Of course.
---Tina, I want to have a pet. How about a dog? --- I prefer a cat. It is ______ to take care of.
This piece of music is worth __________.
---Oh, my God! We have missed the last bus. What shall we do? ---I’m afraid we have no ________ but to take a taxi.
---It’s said that scientists have ________ a way to deal with the disease(疾病) ---Really? That’s great!