Which would you like to see, my passport or my ID card? — Oh, _______.

I don’t know what ________ of students in that school is, but you can see there are _________ of bikes and e-bikes outside the gate.

Mr. Duncan raised an unnecessary question__________-he then failed to find an answer.

Water is much more precious than electricity, for the water for drinking is__________.

The book __________ I put on the desk just now is gone.[ ]