I feel bored with working all day. —Why not some sports to relax yourself?

The Kings have been in Beijing for three years, so they are familiar ____ the city. [ ]

His mother was born in Green, and Greek was her native language, ___.

I was leaving the office when it suddenly 　　　 to me that I had forgotten my keys.

________ will you stay with me?—I will stay with you for ten days.[ ]