4. We believe ______ you have been devoted to ______ naturally of great necessity.
The media today can draw public attention to _______help is actually needed.
It is obvious that talking about something behind others is what everyone will not ______.
The children are having a good time, ______ with sand, others with toys.
The reason ______ his coming to China is ______ he wants to study in China.
On the opposite wall _____ one map _____ dozens of pictures.