David helps his mother with her housework every Saturday for about _____.
| A．one and half hours | B．a half and an hour |
| C．an hour and half | D．one and a half hours |
The majority of the people surveyed are _______ bringing down the housing price, which is terribly high for the general public.
| A．in search of | B．in charge of | C．in favour of | D．in honour of |
The old lady was so pleased with all ______ we had done for her ______ she wrote us a thank-you letter.
| A．what; that | B．that; that | C．which; that | D．that; what |
When he came to life, he found himself ______ to a tree.
| A．tied | B．being tied | C．to be tied | D．having tied |
Only that factory we visited yesterday __________ this kind of machines.
| A．produces | B．does it produce | C．did it produce | D．producing |
--- Roy and Samantha got married last week. Did you go to their wedding?
--- No, I ________ an important meeting in another city.
| A．attended | B．have attended | C．had attended | D．was attending |