I remember ______ the math problem ______.But I can’t remember it’s answer.

It was not until all the milu deer ________that we realized we should build a natural park to protect them.

lculation of the result of the exam_______ to the fact, but he failed again．

The first thing ________ we should do is to master the basic grammar.

Personal space means not only an imaginary spacearound the body, but _____ around all the senses.