—What’s the matter with the man hanging his head there?
—Well, if you _______ know, he was caught stealing my bike.
| A．must | B．may | C．can | D．shall |
Many countries have __________ man-made satellites to circle the earth.
| A．sent up | B．given up | C．set up | D．put up |
You should spend more time __________ the lessons rather than playing computer games.
| A．to study | B．study |
| C．to studying | D．studying |
The climbers __________ their ambition by reaching the summit of the mountain.
| A．obtained | B．sustained | C．maintained | D．realized |
As there was not much chance to find good jobs in their hometown, many young men now tried to __________ their fortune in cities.
| A．find | B．find out |
| C．seek | D．look at |
His words are strongly impressed __________ my memory.
| A．in | B．on | C．at | D．for |