Do you know the answer _____ the hard question?[ ]

We’ll be back for our school’s _____ anniversary ceremony(周年庆典). –I see. That means you’ll have a get-together with your classmates in ___ years.

Will Jim go hiking with us this weekend?— Maybe not. He _______ to visit his grandpa in the country.

Although Little Binging got a very serious illness, people didn’t ___________ this poor baby and tried their best to save him.

Would you mind _________ your voice down? We are doing our homework.–Sorry for that.