This is the small house less than 15 square meters, under ______ roof lives a large family of three generations.
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.
He spoke about the country as if he had been there, but ________ he had never.
This is the very reason ______ he gave for his coming late to the meeting.