The wheat fields are irrigated by water _____ from a pond through bamboo pipes.
The reason _____ he refused to attend the meeting was that they didn’t give him an invitation earlier.
It is _______ he had to send his brother to hospital _______ he was late.
September 11, 2001 is the day ______ we will never forget.
How do you _______it and what should you ________it?
-Do you know our hometown at all?-No, this is the first time I _______ here.