Here are _________200 animals in the zoo.[ ]

Her voice sounds _______. I don’t want to listen to her singing.

It’s two and a half weeks since the exchange students __________ Wuxi.

How did they come to school today?—Because of the rain they came to school onfoot _____ a bus.[ ]

You must return these books ________ next Monday, or you will be fined. [ ]