--- Hi ,guy! How many plans have you made for the coming summer holiday ?--- at all. Perhaps I’m going to ______ it with my friends .
The research group ____ 15 members has made great achievements in recent years.
When the star fell ____ the darkness quickly at night,all the people felt it amazing.
It's an either-or situation.You can watch TV or play games,but you can't do ____.
--I'd like to book a room for tonight.--Sorry,sir,but we don't have any rooms ____ right now.
The astronauts were so interested in____ beauty of nature that they took lots of pictures in____ space.