It is the first time that a developing country _______ the Expo, described as the Olympic Games of economy, science and technology．
| A．is hosting | B．has hosted | C．hosts | D．will host |
After a careful survey about the cause of the newly-built bridge, they finally came to a(n) _________ that it was due to the heavy rain.
| A．construction | B．motivation | C．conclusion | D．impression |
He had to pause from time to time to wipe the sweat from his forehead, because the air-conditioning system ____.
| A．broke in | B．broke up | C．broke out | D．broke down |
Computers and mobile phones, though they are indeed making our life ____ and more ____, have reduced the need for face-to-face communications.
| A．easily; efficient | B．easier; efficient | C．easy; efficiently | D．easily; efficiently |
The woman ____there under the tree, ____ in a blue shirt, is our headmaster.
| A．sitting; wearing | B．sitting; dressed | C．seating; dressed | D．seated; dressing |
The new technology, if____ to farming, will help increase the grain output.
| A．applying | B．to apply | C．applied | D．having applied |