It was some time ________ we realized that we lost the chance forever.
Have you ever seen the singing star we love very much?[ ]
Can you tell me _____ the birdwatchers in Zhalong Nature Reserve? I only know that _____ of them are from our school.
Guess, how much does it cost? —I think it costs15 and 20 dollars. [ ]
Sunday is the _______ day of a week.