By the time he realizes he __________ into a trap, it'll be too late for him to do anything about it.
| A．walks | B．walked |
| C．has walked | D．had walked |
Sit on the edge of _____ bed _____ minute before putting your feet on the floor.
| A．/; a | B．the; a | C．the; the | D．/; the |
For each individual, sport is ___ possible source for inner improvement. Olympism seeks to create a way of life based on ___ joy found in effort.
| A．a; a | B．the; the | C．a; the | D．the; a |
General speaking, ___ graduate from ____ well—known university is more likely to find a good job.
| A．a, the | B．a, a | C．the, a | D．the, the |
On Sept. 29, 2008，Shen Zhou VII returned to _______ earth from _______ space successfully.
| A．the; / | B．/; the | C．/; / | D．the; the |
John is ______ European but doesn’t know or speak ______English language at all.
| A．an，a | B．a，the | C． the ，an | D．a，不填 |