—Why are your eyes so red? You ________ have slept well last night.—Yeah, I stayed up late writing a report.
What do the five rings on the Olympic flag ___________?
Visitors were _______ at the ________pictures that the guide showed.
I can never forget the day ________ we worked together and the day ________ we spent together.
Is this the reason _______ he was late for the meeting?
I have many friends, _______some are businessmen..