用I doubt whether/if/I don't doubt that There is no doubt that/about/without doubt 完成句子。

1. 毫无疑问,我们的实验会成功的.

  There is no doubt  _____  our experiment will succeed.

2. 她是否会准时来有点让人怀疑.

  There is some doubt  _____  she will come on time.