Sometimes it is very difficult to _______ some of the English words. Even the native speaker can not help.
C
暂无解析
Whathesaidinthemeeting_______everybodypresent.
Whenaspacecrafttravels,oneofthemajorproblemsisreentryintotheEarth’s_______.
Ifyouhaveanyproblemsduringyourstudyhere,pleasedonot_______tocallmeforhelp