You______ her in her office last Friday; she's been out of town for two weeks.
| A．needn't have seen | B．must have seen | C．might have seen | D．can't have seen |
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 |
-- How do you find the movie Avatar？
--- Fascinating. It is ____________ again.
| A．worth watching | B．worth to watch | C．worthy watching | D．worthy to watch |