Sometimes our opinions differ _________ what we choose to observe and how we deal with what we’ve observed
| A．which | B．since | C．because | D．because of |
—Is there any mail?
—No, ______ at all．
| A．nothing | B．none | C．no one | D．neither |
Programmes, ______ to bring the old and the young together, are growing in popularity all over the world．
| A．designed | B．to be designed |
| C．designing | D．having designed |
David _____ a customer when the fire started．
| A．served | B．was serving | C．had served | D．would serve |
Martin drove along ______ he found a convenient parking place．
| A．after | B．when | C．until | D．since |
—Excuse me, visiting hours are over．It' s time for you to leave．
—I' m sorry, I didn't know the time or I ______ earlier．
| A．will leave | B．would leave |
| C．had left | D．would have left |