Mr. Smith left home and went to Shenzhen in his twenties, where he _______ until the 1990s.
Alice received an invitation from her boss,________ came as a surprise.
I have bought two ballpens,________ writes well.
Is ________ some German friends visited last week?
Is there anyone in your class ________ family is in the country?
The engineer ________ my father works is about 50 years old.