We won’t keep winning games ________ we keep playing well.
| A．because | B．unless | C．when | D．while |
--- I once got lost during my first visit to Beijing.
-- Oh, did you? You _______ me as your guide.
| A．might have asked | B．could ask | C．would have asked | D．would ask |
How long do you think it will be _______ scientists succeed in providing a cure for cancer?
| A．when | B．after | C．since | D．before |
When my father lost his job our living _______ had to be cut to the bone.
| A．bills | B．expenses | C．prices | D．charges |
The two naughty boys were quiet when eating, and they were accustomed to ______ at meals.
| A．talk | B．talking | C．not to talk | D．not talking |
This novel is _______ that one, so I like neither of them.
| A．as interesting as | B．no more interesting than |
| C．not more interesting than | D．not more interested than |