Since nobody gave him any help，he ________ have done the research on his own.
(2013·大纲全国，26)
| A．can | B．must |
| C．would | D．need |
--What’s ___ population of China?
--China has ____ population of 1.5 billion.
| A．a; the | B．the; a | C．/;/ | D．the; the |
--what do you think of the film? ---_____?
| A．Excitedly | B．Very well | C．It’s wonderful | D．I think so |
Is ____ dangerous to swim in the river alone?
| A．it | B．this | C．that | D．he |
--___do you clean the reading room?
---Every two or three days.
| A．How long | B．How far | C．How soon | D．How often |
Jane goes to Paris to spend her holiday ____.
| A．each other | B．other each year | C．every other year | D．other every year |