Instructions for homework have to be ______ so that every student knows clearly what is to do after class.
. It could be judged from her eyes ________ she was very satisfied with her performance.
The work is not very profitable __________ cash, but I am getting valuable experience from it.
________ that we can’t afford to waste it.
It is generally accepted that Chinese were the earliest ________ football while the European established the modern rules for football.
While we were listening to the speech attentively, a voice ________ to announce the result of the election