- How often are the Olympic Games held? -             four years.       
#42406
A
Every
B
Each
C
In
D
For
推荐题目
Simon always feels sure about his own ability, he is so ______ 
#43106
A
energetic
B
outgoing
C
imaginative
D
confident
Where is your_____ shoe? 
#43504
A
another
B
other
C
the other
D
others
Here is the book. First ______it and then tell me what you think of it.
#43097
A
look into
B
look through
C
look up
D
look after