A dog's eating habit requires regular training before it is ___________ established.
| A． |
properly |
B． |
widely |
C． |
originally |
D． |
temporarily |
______ the average age of the population increases, there are more and more old people to care for.
| A． |
Unless |
B． |
Until |
C． |
As |
D． |
While |
---I'm thinking of going back to school to get another degree.
---Sounds great!_____.
| A． |
It all depends |
B． |
Go for it |
C． |
Never mind |
D． |
No wonder |
It was really annoying; I _____ get access to the data bank you had recommended.
| A． |
wouldn't |
B． |
couldn't |
C． |
shouldn't |
D． |
needn't |
The cooling wind swept through out bedroom windows, ____ air conditioning unnecessary.
| A． |
making |
B． |
to make |
C． |
made |
D． |
being made |
When walking down the street, I came across David, when I _____ for years.
| A． |
didn't see |
B． |
haven't seen |
C． |
hadn't seen |
D． |
wouldn't see |