It will be at least three years _______ we get to meet again.
Is this factory ______ the foreign investors are going to visit next month?
I couldn’t move my legs. It was ______ they were stuck to the floor.
Can you tell me the name of the school ______ you visited last week?
The doctor ______ a cure for the disease .
You really don't know what we ______ while we were working on this project .