—How many __________ are there in your class？—Twenty-two.

 国际奥林匹克委员会已经决定第31届奥运会于2016年在里约热内卢举办。这个组织的英文简写是_________.

H7N9 is a new kind of          .

Is there any ___________in the box?

The students enjoy Miss Yang’s classes because she’s a teacher with rich teaching _________.