Our monitor didn’t see all the students, because        was ill and didn’t come to school today.

—You look sad, Kate.  —Yeah, I have made __________mistakes in my report.

I’d appreciate         if you could turn the radio down. I’m doing my homework.

Alone in a deserted house, he was so busy with his research work that he felt ___but lonely.

Meeting my uncle after all these years was an unforgettable moment, _        I will always treasure．