a good idea后面加什么

1.It would be a good idea to call before we leave.我们出发之前打个电话是个好主意。

2.It seemed like a good idea at the time, and then it all went horribly wrong.那在当时似乎是个好主意，但后来却铸成大错。

3.It seemed like a good idea at the time.当时这主意好像不错。