---- Where is mother?
---- She is in the kitchen. She ______ the housework all morning.
| A．was doing | B．has done | C．has been doing | D．is doing |
It is in this very village ______ she will build her first school, ______ inspires everyone to help her.
| A．where; that | B．that; which |
| C．that; that | D．which; that |
Mary was only too ready to help others, seldom, ______ refusing them when they turned to her.
| A．if never | B．if not |
| C．if any | D．if ever |
Mr. Wang made up his mind to devote all he could ______ his oral English before going abroad.
| A．improve | B．to improve |
| C．improving | D．to improving |
Influenza HINI is an illness that can result in death unless ______ in time.
| A．treat | B．to treat |
| C．treating | D．treated |
MSN, ______ you can chat with your friends, makes communication easy.
| A．why | B．which |
| C．that | D．where |