Lian Zhan with his visitors _____ from Taiwan _____ paying his first visit to the mainland of China. [ ]

While I was cleaning my room, my aunt ________.

Excuse me, could you tell me ? — There is an e–shop on the third floor. You can repair it there.

Mum, have you seen my mobile phone?—_______ you bought last week? I’m afraid I haven’t seen _______.

David talked with a friend of ____ on the Internet for a long time yesterday.