—Where did you find our chemistry teacher? —It was in the lab ______ he was doing his experiment.
The majority of the people surveyed are _______ bringing down the housing price, which is terribly high for the general public.
The old lady was so pleased with all ______ we had done for her ______ she wrote us a thank-you letter.
When he came to life, he found himself ______ to a tree.
Only that factory we visited yesterday __________ this kind of machines.
--- Roy and Samantha got married last week. Did you go to their wedding? --- No, I ________ an important meeting in another city.