He ______ the math problem, his classmates wanted to help him out.
---What do you think of my article, professor? ---The former part is well written but _____ is just so so.
He was told that it would be at least three more months ______ he could recover and return to work.
To their surprise, they found the lecture given by the famous professor easy ______.
It was the first time ________ I ________ face to face with a thunder storm.
Hurry up! The train______. You know it______ at 8:30 am.