Tom hid himself behind the door, _______ he rushed out to scare his mother.
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.
He knows several languages ________ English, French and Japanese.