It is useful to be able to predict the extent _______which a price change will affect supply and demand.
| A．from |
| B．with |
| C．to |
| D．for |
The thing that ________ is not whether you fail or not, but whether you try or not.
| A．matters | B．cares |
| C．minds | D．considers |
—There is still a copy of the book in the library. Will you go and borrow ____?
—No, I’d rather buy ____ in the bookstore.
| A．it; one | B．one; one |
| C．one; it | D．it; it |
We must take measures to stop various kinds of pollution ______ the environment gets worse.
| A．unless | B．until |
| C．before | D．when |
The rumor has been confirmed __________ UN peacekeeping forces would take operations in the region .
| A．what | B．why | C．that | D．how |
Hearing his friend calling him , out __________ .
| A．rushing the boy | B．the boy was rushing |
| C．rushed the boy | D．did the boy rush |