If you have a holiday, why not ________ on a trip?
| A．consider to go | B．to consider to go |
| C．consider going | D．considering going |
The research group ____ 15 members has made great achievements in recent years．
| A．is made up of | B．makes up |
| C．made up of | D．making up of |
When the star fell ____ the darkness quickly at night，all the people felt it amazing．
| A．down | B．off |
| C．behind | D．through |
It's an either-or situation．You can watch TV or play games，but you can't do ____．
| A．others | B．either |
| C．another | D．both |
--I'd like to book a room for tonight．
--Sorry，sir，but we don't have any rooms ____ right now．
| A．able | B．comfortable |
| C．available | D．suitable |
The astronauts were so interested in____ beauty of nature that they took lots of pictures in____ space．
| A．the; / | B．the；the |
| C．/；the | D．/; / |