三道英语选择题,选择并阐释.

三道英语选择题,选择并阐释.
The big sign on the back of my door that says "keys" is to ______________ my keys when I go out.
A.remind me of taking
B.remind me to take
C.memorize me to take
D.memorize me of taking
______________,you should use your memory as much as possible.
A.To put it simply
B.To put it simple
C.To take it simple
D.To make it simply
Here are some factors they believe to be important in ______________ memory capacity.
A.raising
B.rising
C.expanding
D.inflating