25.—Can you tell me the timetable of the school bus? —Well,the bus________here for the first trip at 6:30am.
We students got lost in the forest and decided to remain ____we were and waited for the guide
—Oh my god! You__ wear slippers to attend the conference. —I'm sorry I forgot there is a conference.
In this experiment, the famous professor showed three different____ to the study of physics.
_______the match is lost? We can fight again!
These achievements_______ without the contribution of Qian Xuesen, a key leader of the New China's nuclear, missile and so on.