医生表示玛丽能否康复还是未知数。

The doctor says it is ___touch ___and ___go whether Mary will recover.

赚大钱的想法当然吸引我，但这份工作是否从一开始就能带来很多钱还是未知数。

The idea of earning a lot certainly appeals to me but it's ___touch ___and ___go whether the job may bring a lot of money right from the start.

事故后，他的生死未卜了好几天。

After the accident, his survival was ___touch ___and ___go for several days.