______ the illness pneumonia, Jackson couldn’t go on teaching.
| A．As a result | B．As the result |
| C．As result of | D．As a result of |
"Genius" is a complicated concept, _ _ many different factors.
| A．involved | B．involving | C．to involve | D．being involved |
- We've only got this small bookcase. Will that do?
- No, _ _ I am looking for is something much bigger and stronger.
| A．who | B．that | C．what | D．which |
--- Was it by cutting down staff _ _she saved the firm?
----- No, it was by improving work efficiency.
| A．when | B．what | C．how | D．that |
The club, _ _ 25 years ago, is holding a party for past and present members.
| A．founded | B．founding | C．being founded | D．to be founded |
Have you sent thank-you notes to the relatives fromyou received gifts?
| A． | which | B． | them | C． | that | D． | whom |