The development of industry has been ________ gradual process throughout ________human existence，from stone tools to modern technology.
| A．不填；the | B．the；a |
| C．a；不填 | D．a；a |
The old man is ________ enough to contribute $ 10,000 to the disaster area damaged by the earthquake.
| A．considerate | B．generous |
| C．fashionable | D．concerned |
—Hello！I want to book a double room.
—Sorry.There is no double room ________.
| A．suitable | B．available |
| C．comfortable | D．cheap |
The young man comes from a(n) ________ family，who owns several companies in London and Paris.
| A．energetic | B．intelligent | C．anxious | D．wealthy |
—What was it that caused the party to be put off?
—________ the invitations.
| A．Because Tom delayed sending |
| B．Tom delayed to send |
| C．That Tom delayed sending |
| D．Tom delayed sending |
The new technology，if ________ to farming，will help increase the grain output.
| A．applying | B．to apply |
| C．applied | D．having applied |