In the future, senior citizens will be able to go anywhere using high-tech cameras _______ to their head.
Tom hardly had time for concerts at that time, ________?
—Must I return the book tomorrow? —No, you ________.You can keep it for three days.
The Olympic Games is held ________.
Hainan is a very good island.It's the second ________ island in China.
The accident happened ________ a cold winter morning.