医生说玛丽能否康复还很难说。

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

创业初期往往成败难料。

Starting a new business is often ___touch ___and ___go.

比赛只剩两分钟，结果仍悬而未决。

With only two minutes left, the outcome of the game was still ___touch ___and ___go.