My cousin likes dressing up _____ a monkey.[ ]

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.

Who’s singing in the next room? Is it Lucy?—Itbe her. She has gone to New York.

My mother is going to supermarket for rice and noodles．

People open their presents _____ Christmas Day. [ ]