What’s the number of students in your school—We have over _______students.

The police refused to _____ the clues they were working on.

Excuse me , where’s the City Library—It’s a Sunday run to go there , you’d better take a taxi.

The beautiful scenery in Switzerland is very ________to the tourists from the whole world.[ ]

Nature reserves are very important for preserving many animals and plants, which would _______ run the risk of becoming extinct