All passengers ____, please fasten your seat belts and remain seated ____the plane is landing.
The market for ______ used computers is getting larger and larger as______ years go on.
“What about ______ school?” “It is as good, as anybody can see, _____ school as No 1 Middle School Attached to Hunan Normal University.”
—John has put forward _______ most challenging question for us to answer.—Yes, it really is. I have never heard _______ harder one.
I often have conversations with John over ______ telephone, while keep in touch with Tom by ______ letter.
The education of ______ young is always ______ hot and serious topic.