He devoted most of his time to his research, believing his hard work would___sooner or later.
| A．put off | B．take off | C．come off | D．pay off |
The scientists are beating their brains, trying to ______ a solution to the problem.
| A．look up to | B．live up to | C．come up with | D．keep up with |
The opening ceremony of the Olympic Games will be broadcast ______ this weekend. You can expect an exactly ______ night.
| A．alive; lovely | B．live; lively | C．live; alive | D．lovely; lively |
______from the top of the mountain, the village looks like a small box.
| A．Seen | B．Being seen | C．To see | D．Seeing |
When the spaceship traveled above，______new looking earth appeared before us，______earth that we had never seen before.
| A．a；the | B．the；an | C．/；the | D．a；an |
Don’t reply to any e-mails _______ personal information, no matter how official or formal they appear.
| A．searching | B．asking | C．offering | D．requesting |