We think ____ our duty to pay taxes to our government.
--- What else do you want to know about the cell phone? -- _______ it can be used as a digital camera. You know, I’m into photography.
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.