If it ________ for the heavy rain then, we would have arrived here ahead of time.
Every minute must be made full use of ____ our lessons, for the final examination is coming.
The foreigner does speak Chinese well, but of course not _____ we Chinese.
The reason _____ he refused to attend the meeting was that they didn’t give him an invitation earlier.
—Thank you for joining in our conversation tonight.—_____.
It was in the street_________ I met Mary yesterday .