单词填写 (共6小题，每小题1分，满分6分)
If you are unhappy with the jacket, you can take it back and e     it for another.
His problem is not physical but m    .
Every student p       a student ID card.
Our system has to be f       enough to satisfy the needs of different people.
Nowadays some children are a        to computer games.
Nobody can p      what will happen in the future.