What ______ had Bob walked farther, as far as the river bank?
| A．would happen | B．could happen | C．would have happened | D．needn’t have happened |
Technology has quickened the rate _________ we communicate with the world around us.
| A．for which | B．at which | C．to which | D．with which |
Some people think it __________ privilege to study abroad, but it doesn’t make _________ sense if you go when you even cannot look after yourself.
| A．a; 不填 | B．a; the | C．the; 不填 | D．the; a |
--- 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 |