The number of the teacher invited _____ twelve, but a number of them ___ late for different reasons.
You will fall in love with that city _____ you learn about it.
Many websites have been _______ to help people study foreign languages.
This is the deepest swimming pool _______ I have ever seen in China.
Kathy told me that all the doors and windows _______ when she arrived this morning.
It was in the forest _______they found the lost cow.