According to the information from the airline, a small sinking part of the runway of the airport is _____________ for the accident.
---How many teachers are there in your school? --- __________. , but I'm not sure.
There are _________ doctors and nurses working hard in that hospital.
--- What's one fourth and a half, do you know? --- Yes, it's _________.
Now children, turn to page ________ and look at the _______ picture in Lesson Two.
Both of the two rulers are broken. I want to buy a _______ one.