__________ some medals came to live in the sea is not known.
The housewe used to livehas been rebuilt.
In an experiment, pet owners are being encouraged to take their pets to work, a move _______ can be good for both the people and the pets.
By nine o'clock, all the Olympic torch bearers had reached the top of Mount Qomolangma, ___________ appeared a rare rainbow soon.
Is this the restaurant ___________ ?
She was so angry at all ______ I was doing ______ she walked out.