________ many countries in Latin America have been trying to reduce gaps in income, America has allowed inequality to grow.
| A．While | B．Since | C．If | D．Where |
There used to be a mountain in our village, at the top of which ________.
| A．stood a temple | B．was there a temple |
| C．a temple stood | D．a temple was there |
It was along the Mississippi River ________ Mark Twain spent much of his
childhood.
| A．how | B．which | C．that | D．where |
Linda，make sure the tables ________ before the guests arrive.
| A．be set | B．set |
| C．are set | D．are setting |
________caused the accident is still a complete mystery.
| A．What | B．That | C．How | D．Where |
—May I borrow your computer?
—Sorry, it is ________ at the moment.
| A．of no use | B．out of use |
| C．of use | D．in use |