@Akira1108
1. This is all right! What feels more natural to me: It will be cold when winter comes.
2. This is perfect!
3. This is perfect!
4. This is all right! What feels more natural to me: I will be frustrated just watching them. (Unless you mean having them cooped up inside all the time will be frustrating, in which case: Having them underfoot will frustrate me, too.)
5. This is all right! What feels more natural to me: I see this cycle coming, or I can see this cycle coming.