________ the 2020 Olympic Games will be held in Beijing is not known yet.
The organizing committee announces that tickets at the Grand Stadium are limited and will be _______ to those who apply first.
Peter is a brilliant language leaner. Within two weeks, he has developed a good _______ of Chinese and Japanese.
In spite of the city’s crowded urban environment, opportunities for outdoor _______ are never lacking.
Every month he measures his baby daughter against the wall to see how much ____ she is getting.
---Could we finish the project according to the schedule?---I doubt that. The problem remains ______ we can get financial aid within this week.