A number of tests have been conducted to _______ that these drugs have no side effects.
| A．find out | B．look for |
| C．make sure | D．work out |
A poet and artist _____ coming to speak to us about Chinese literature and painting tomorrow afternoon.
| A．is | B．are | C．will | D．has |
Going on a trip into_____ space must be quite __ exciting experience.
| A．/; the | B．/; an | C．the; an | D．the; the |
. The storm left,_______ a lot of damage to this area.
| A．caused | B．to have caused | C．having caused | D．to cause |
It was in the small house _____ was built with stones by his father ____ he spent his childhood.
| A．which; that | B．where; that | C．which; which | D．that; which |
. With the development of science, more new technology____ to the field of IT.
| A．is being introduced | B．has introduced |
| C．is introducing | D．was introduced |