.Wait till you are more ______. It’s better to be sure than sorry.

下列用横线连接的词，全是反义词的一项是（ ）

Mike, could I use your computer —Sorry, I’m going to _______it now.

There ____ a set of keys in the Lost and Found case.

It was __________ computer games thatcost the young man a lot of precious time that he ought __________ on hislessons