What’s on the desk? —There ______ a pen, a book and two keys.

You must have waited here for a long time, __________?

Jack, when shall we go to visit Mr. Smith? – It’s up to him. We’ll go to see him whenever _______.

I live _____ a flat_____ Shanghai. [ ]

Attention！_______ in the form right now，making sure that every detail supplied is accurate.